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Template:Infobox diagnostic Diffusing capacity (DL_CO) is the part of a comprehensive series of tests (the pulmonary function tests) that is done to determine the overall ability of the lung to transport gas into and out of the blood. DL_CO is reduced in certain diseases of the lung and heart. This test has been standardized according to a position paper^[1] by a task force of the European Respiratory and American Thoracic Societies.

In respiratory physiology, the diffusing capacity has a long history of great utility, but the words themselves are now misleading because they are archaic: neither is diffusion measured nor is the value obtained from this test a capacity nor even a capacitance, but in fact a conductance. While the term diffusing capacity is retained in the United States for reasons of historical continuity, terminology using transfer factor is now preferred in Europe and elsewhere. Nevertheless, there are 7 - 8 times more citations for the original terminology in PubMed, so any change in usage will be slow to happen.

Worse still, the term diffusing capacity is positively misleading, since gas transport is not diffusion limited in all but the most extreme cases, such as for oxygen uptake at very low ambient oxygen or at very high pulmonary blood flow. Critics of the term "diffusion capacity" argue that it may be misleading for other reasons as well, and point out two problems with the term. The first is that the test measures not just diffusion across the alveolar-capillary membrane, but also takes into account factors affecting the chemical combination of a given gas with hemoglobin. The second criticism is that the test is typically measured under submaximal conditions and doesn't truly reflect a functional capacity. For these reasons the term "transfer factor" has been proposed to better reflect the physiological process being measured.^[1]

Finally, the diffusing capacity does not directly measure the primary cause of hypoxemia, or low blood oxygen, namely mismatch of ventilation to perfusion:^[2]

Not all pulmonary arterial blood goes to areas of the lung where gas exchange can occur (the anatomic orphysiologic shunts), and this poorly oxygenated blood rejoins the well oxygenated blood from healthy lung in the pulmonary vein. Together, the mixture has less oxygen than that blood from the healthy lung alone, and so is hypoxemic.
Similarly, not all inspired air goes to areas of the lung where gas exchange can occur (the anatomic and the physiological dead spaces), and so is wasted.

Calculation

The diffusion capacity for oxygen $(D_{L_{O_{2}}})$ is the proportionality factor relating the rate of oxygen uptake into the lung to the oxygen gradient between the capillary blood and the alveoli (per Fick's laws of diffusion). In respiratory physiology, it is convenient to express the transport of gas molecules as changes in volume, since $V_{O_{2}} \propto n_{O_{2}}$ (i.e., in a gas, a volume is proportional to the number of molecules in it). Further, the oxygen concentration (partial pressure) in the pulmonary artery is taken to be representative of capillary blood. Thus, $(D_{L_{O_{2}}})$ can be calculated as the ratio of the volume of the oxygen taken up by the lung $({\dot{V}}_{O_{2}})$ divided by the oxygen gradient between the alveoli ("A") and the pulmonary artery ("a"). Template:NumBlk

(For

\dot{V}

, say "V dot". This is the notation of Isaac Newton for a first derivative (or rate) and is commonly used in respiratory physiology for this purpose.)

{\dot{V}}_{O_{2}}

is the rate that oxygen is taken up by the lung (ml/min).

P_{A_{O_{2}}}

is the partial pressure of oxygen in the alveoli.

P_{a_{O_{2}}}

is the partial pressure of oxygen in the pulmonary artery.

P_{v_{O_{2}}}

is the partial pressure of oxygen in the systemic veins (where it can actually be measured).

Thus, the higher the diffusing capacity $D_{L}$ , the more gas will be transferred into the lung per unit time for a given gradient in partial pressure (or concentration) of the gas. Since it can be possible to know the alveolar oxygen concentration and the rate of oxygen uptake - but not the oxygen concentration in the pulmonary artery - it is the venous oxygen concentration that is generally employed as a useful approximation in a clinical setting.

Sampling the oxygen concentration in the pulmonary artery is a highly invasive procedure, but fortunately another similar gas can be used instead that obviates this need. Carbon monoxide (CO) is tightly and rapidly bound to hemoglobin in the blood, so the partial pressure of CO in the capillaries is negligible and the second term in the denominator can be ignored. For this reason, CO is generally the test gas used to measure the diffusing capacity and the $D_{L}$ equation simplifies to: Template:NumBlk

Test Performance

The single-breath diffusing capacity test is the most common way to determine $D_{L}$ .^[1] The test is performed by having the subject blow out all of the air that he/she can, leaving only the residual lung volume of gas. The person then inhales a test gas mixture rapidly and completely, reaching the total lung capacity as nearly as possible. This test gas mixture contains a small amount of carbon monoxide (usually 0.3%) and a tracer gas that is freely distributed throughout the alveolar space but which doesn't cross the alveolar-capillary membrane. Helium and methane are two such gasses. The test gas is held in the lung for about 10 seconds during which time the CO (but not the tracer gas) continuously moves from the alveoli into the blood. Then the subject exhales.

The anatomy of the airways brings with it complications, since the inspired air must pass through the mouth, trachea, bronchi and bronchioles before it gets to the alveoli where gas exchange will occur; on exhalation, alveolar gas must return along the same path, and so the exhaled sample will be purely alveolar only after a 500 to 1,000 ml of gas has left the subject. While it is algebraically possible to approximate the effects of anatomy (the three-equation method^[3]), disease states introduce considerable uncertainty to this approach. Instead, the first 500 to 1,000 ml of the expired gas is disregarded and the next portion which contain gas that has been in the alveoli is analyzed.^[1] By analyzing the concentrations of carbon monoxide and inert gas in the inspired gas and in the exhaled gas, it is possible to calculate $(D_{L_{C O}})$ according to Equation == Polo Shirts 1 ==

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. First, the rate at which CO is taken up by the lung is calculated according to:

Template:NumBlk

The pulmonary function equipment monitors the change in the concentration of CO that occurred during the breath hold,

Δ [C O]

, and also records the time

Δ t

.

The volume of the alveoli,

V_{A}

, is determined by the degree to which the tracer gas has been diluted by inhaling it into the lung.

Similarly, Template:NumBlk where

F_{A_{C O_{O}}}

is the initial alveolar fractional CO concentration, as calculated by the dilution of the tracer gas.

V_{B}

is the barometric pressure

Other methods that are not so widely used at present can measure the diffusing capacity. These include the steady state diffusing capacity that is performed during regular tidal breathing, or the rebreathing method that requires rebreathing from a reservoir of gas mixtures.

Interpretation

In general, a healthy individual has a value of $D_{L_{C O}}$ between 75% and 125% of the average.^[4] However, individuals vary according to age, sex, height and a variety of other parameters. For this reason, reference values have been published, based on populations of healthy subjects^[5]^[6]^[7] as well as measurements made at altitude,^[8] for children^[9] and some specific population groups.^[10]^[11]^[12]

Blood CO levels may not be negligible

In heavy smokers, blood CO is great enough to influence the measurement of $D_{L_{C O}}$ , and requires an adjustment of the calculation when COHb is greater than 2% of the whole.

The two components of $D_{L_{C O}}$

While $(D_{L})$ is of great practical importance, being the overall measure of gas transport, the interpretation of this measurement is complicated by the fact that it does not measure any one part of a multi-step process. So as a conceptual aid in interpreting the results of this test, the time needed to transfer CO from the air to the blood can be divided into two parts. First CO crosses the alveolar capillary membrane (represented by $D_{M}$ ) and then CO combines with the hemoglobin in capillary red blood cells at a rate $θ$ times the volume of capillary blood present ( $V_{c}$ ).^[13] Since the steps are in series, the conductances add as the sum of the reciprocals:

Template:NumBlk

Any change in $V_{c}$ alters $D_{L_{C O}}$

The volume of blood in the lung capillaries, $V_{c}$ , changes appreciably during ordinary activities such as exercise. Simply breathing in brings some additional blood into the lung because of the negative intrathoracic pressure required for inspiration. At the extreme, inspiring against a closed glottis, the Müller's maneuver, pulls blood into the chest. The opposite is also true, as exhaling increases the pressure within the thorax and so tends to push blood out; the Valsalva maneuver is an exhalation against a closed airway which can move blood out of the lung. So breathing hard during exercise will bring extra blood into the lung during inspiration and push blood out during expiration. But during exercise (or more rarely when there is a structural defect in the heart that allows blood to be shunted from the high pressure, systemic circulation to the low pressure, pulmonary circulation) there is also increased blood flow throughout the body, and the lung adapts by recruiting extra capillaries to carry the increased output of the heart, further increasing the quantity of blood in the lung. Thus $D_{L_{C O}}$ will appear to increase when the subject is not at rest, particularly during inspiration.

In disease, hemorrhage into the lung will increase its hemoglobin content, and so increase $D_{L_{C O}}$ .

Finally, $V_{c}$ is increased in obesity and when the subject lies down, both of which increase the blood in the lung by compression and by gravity and thus both increase $D_{L_{C O}}$ .

Reasons why $θ$ varies

The rate of CO uptake into the blood, $θ$ , depends on the concentration of hemoglobin in that blood, abbreviated Hb in the CBC (Complete Blood Count). More hemoglobin is present in polycythemia, and so $D_{L_{C O}}$ is elevated. In anemia, the opposite is true. In environments with high levels of CO in the inhaled air (such as smoking), a fraction of the blood's hemoglobin is rendered ineffective by its tight binding to CO, and so is analogous to anemia. It is recommended that $D_{L_{C O}}$ be adjusted when blood CO is high.^[1]

The lung blood volume is also reduced when blood flow is interrupted by blood clots (pulmonary emboli) or reduced by bone deformities of the thorax, for instance scoliosis and kyphosis.

Varying the ambient concentration of oxygen also alters $θ$ . At high altitude, inspired oxygen is low and more of the blood's hemoglobin is free to bind CO; thus $θ$ is increased and $D_{L_{C O}}$ appears to be increased. Conversely, supplemental oxygen increases Hb saturation, decreasing $θ$ and $D_{L_{C O}}$ .

Lung diseases that reduce $D_{M}$ and $θ * V_{c}$

Diseases that alter lung tissue reduce both $D_{M}$ and $θ * V_{c}$ to a variable extent, and so decrease $D_{L_{C O}}$ .

Loss of lung parenchyma in diseases like emphysema.
Diseases that scar the lung (the interstitial lung disease), such as idiopathic pulmonary fibrosis, or sarcoidosis
Swelling of lung tissue (pulmonary edema) due to heart failure, or due to an acute inflammatory response to allergens (acute interstitial pneumonitis).
Diseases of the blood vessels in the lung, either inflammatory (pulmonary vasculitis) or hypertrophic (pulmonary hypertension).

Lung conditions that increase $D_{L_{C O}}$ .

Alveolar hemorrhage Goodpasture's syndrome,^[14] polycythemia,^[15] left to right intracardiac shunts,^[16] due increase in volume of blood exposed to inspired gas.
Asthma due to better perfusion of apices of lung. This is caused by increase in pulmonary arterial pressure and/or due to more negative pleural pressure generated during inspiration due to bronchial narrowing.^[17]

History

In one sense, it is remarkable that DL_CO has retained such clinical utility. The technique was invented to settle one of the great controversies of pulmonary physiology a century ago, namely the question of whether oxygen and the other gases were actively transported into and out of the blood by the lung, or whether gas molecules diffused passively.^[18] Remarkable too is the fact that both sides used the technique to gain evidence for their respective hypotheses. To begin with, Christian Bohr invented the technique, using a protocol analogous to the steady state diffusion capacity for carbon monoxide, and concluded that oxygen was actively transported into the lung. His student, August Krogh developed the single breath diffusion capacity technique along with his wife Marie, and convincingly demonstrated that gasses diffuse passively,^[19]^[20]^[21]^[22]^[23]^[24]^[25] a finding that led to the demonstration that capillaries in the blood were recruited into use as needed - a Nobel prize winning idea.^[26]

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

Template:Respiratory system procedures

de:Kohlenmonoxid-Transferfaktor pl:Badanie zdolności dyfuzji gazów w płucach

↑ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 Macintyre N, Crapo RO, Viegi G, et al. 2005 Standardisation of the single-breath determination of carbon monoxide uptake in the lung. Eur Respir J. 26:720-35 PMID 16204605
↑ West, J. 2011. Respiratory Physiology: The Essentials. 9e. ISBN 978-1-60913-640-6
↑ Graham BL, Mink JT, Cotton DJ. 1981. Improved accuracy and precision of single-breath CO diffusing capacity measurements. J Appl Physiol. 51:1306-13. PMID 7298468
↑ LUNGFUNKTION - Practice compendium for semester 6. Department of Medical Sciences, Clinical Physiology, Academic Hospital, Uppsala, Sweden. Retrieved 2010.
↑ Miller A, Thornton JC, Warshaw R, Anderson H, Teirstein AS, Selikoff IJ. 1983 Single breath diffusing capacity in a representative sample of the population of Michigan, a large industrial state. Predicted values, lower limits of normal, and frequencies of abnormality by smoking history. Am Rev Respir Dis. 127:270-7. PMID 6830050.
↑ Knudson RJ, Kaltenborn WT, Knudson DE, Burrows B. 1987 The single-breath carbon monoxide diffusing capacity. Reference equations derived from a healthy nonsmoking population and effects of hematocrit. Am Rev Respir Dis. 135:805-11. PubMed PMID 3565929.
↑ Cotes JE, Chinn DJ, Quanjer PhH, Roca J, Yernault JC. 1993 Standardization of the measurement of transfer factor (Diffusing capacity). Eur Respir J Suppl 16:41–52. PMID 8499053
↑ Crapo RO, Morris AH, Gardner RM. 1982 Reference values for pulmonary tissue volume, membrane diffusing capacity, and pulmonary capillary blood volume. Bull Eur Physiopathol Respir. 18:893-9. PMID 6927541.
↑ Koopman M, Zanen P, Kruitwagen CL, van der Ent CK, Arets HG. 2011 Reference values for paediatric pulmonary function testing: The Utrecht dataset. Respir Med. 105:15-23. Erratum in: Respir Med. 2011 105:1970-1. PMID 20889322.
↑ Chin NK, Ng TP, Hui KP, Tan WC. 1997 Population based standards for pulmonary function in non-smoking adults in Singapore. Respirology. 1997 Jun;2(2):143-9. PMID 9441128.
↑ Piirilä P, Seikkula T, Välimäki P. 2007 Differences between Finnish and European reference values for pulmonary diffusing capacity. Int J Circumpolar Health. 66:449-57. PubMed PMID 18274210.
↑ Ip MS, Lam WK, Lai AY, et al. Hong Kong Thoracic Society. Reference values of diffusing capacity of non-smoking Chinese in Hong Kong. Respirology. 12:599-606. PMID 17587430.
↑ Roughton FJ, Forster RE 1957 Relative importance of diffusion and chemical reaction rates in determining rate of exchange of gases in the human lung, with special reference to true diffusing capacity of pulmonary membrane and volume of blood in the lung capillaries. J Appl Physiol. 11:290-302. PMID 13475180.
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A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

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↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
↑ One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
↑ Gjedde A. 2010 Diffusive insights: on the disagreement of Christian Bohr and August Krogh Adv Physiol Educ 34: 174-185 PMID 21098384
↑ Krogh A. 1910 On the oxygen metabolism of the blood. Skand Arch Physiol 23: 193–199
↑ Krogh A. 1910 On the mechanism of the gas-exchange in the lungs of the tortoise. Skand Arch Physiol 23: 200–216.
↑ Krogh A. 1910 On the combination of hæmoglobin with mixtures of oxygen and carbonic acid. Skand Arch Physiol 23: 217–223.
↑ Krogh A. 1910 Some experiments on the invasion of oxygen and carbonic oxide into water. Skand Arch Physiol 23: 224–235
↑ Krogh A. 1910 On the mechanism of gas exchange in the lungs. Skand Arch Physiol 23: 248–278
↑ Krogh A, Krogh M. 1910 On the tensions of gases in arterial blood. Skand Arch Physiol 23: 179–192.
↑ Krogh A, Krogh M. 1910 Rate of diffusion into lungs of man. Skand Arch Physiol 23: 236–247
↑ http://www.nobelprize.org/nobel_prizes/medicine/laureates/1920/krogh-bio.html

[multiple-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 Macintyre N, Crapo RO, Viegi G, et al. 2005 Standardisation of the single-breath determination of carbon monoxide uptake in the lung. Eur Respir J. 26:720-35 PMID 16204605

[2] West, J. 2011. Respiratory Physiology: The Essentials. 9e. ISBN 978-1-60913-640-6

[3] Graham BL, Mink JT, Cotton DJ. 1981. Improved accuracy and precision of single-breath CO diffusing capacity measurements. J Appl Physiol. 51:1306-13. PMID 7298468

[uppsala-4] LUNGFUNKTION - Practice compendium for semester 6. Department of Medical Sciences, Clinical Physiology, Academic Hospital, Uppsala, Sweden. Retrieved 2010.

[5] Miller A, Thornton JC, Warshaw R, Anderson H, Teirstein AS, Selikoff IJ. 1983 Single breath diffusing capacity in a representative sample of the population of Michigan, a large industrial state. Predicted values, lower limits of normal, and frequencies of abnormality by smoking history. Am Rev Respir Dis. 127:270-7. PMID 6830050.

[6] Knudson RJ, Kaltenborn WT, Knudson DE, Burrows B. 1987 The single-breath carbon monoxide diffusing capacity. Reference equations derived from a healthy nonsmoking population and effects of hematocrit. Am Rev Respir Dis. 135:805-11. PubMed PMID 3565929.

[7] Cotes JE, Chinn DJ, Quanjer PhH, Roca J, Yernault JC. 1993 Standardization of the measurement of transfer factor (Diffusing capacity). Eur Respir J Suppl 16:41–52. PMID 8499053

[8] Crapo RO, Morris AH, Gardner RM. 1982 Reference values for pulmonary tissue volume, membrane diffusing capacity, and pulmonary capillary blood volume. Bull Eur Physiopathol Respir. 18:893-9. PMID 6927541.

[9] Koopman M, Zanen P, Kruitwagen CL, van der Ent CK, Arets HG. 2011 Reference values for paediatric pulmonary function testing: The Utrecht dataset. Respir Med. 105:15-23. Erratum in: Respir Med. 2011 105:1970-1. PMID 20889322.

[10] Chin NK, Ng TP, Hui KP, Tan WC. 1997 Population based standards for pulmonary function in non-smoking adults in Singapore. Respirology. 1997 Jun;2(2):143-9. PMID 9441128.

[11] Piirilä P, Seikkula T, Välimäki P. 2007 Differences between Finnish and European reference values for pulmonary diffusing capacity. Int J Circumpolar Health. 66:449-57. PubMed PMID 18274210.

[12] Ip MS, Lam WK, Lai AY, et al. Hong Kong Thoracic Society. Reference values of diffusing capacity of non-smoking Chinese in Hong Kong. Respirology. 12:599-606. PMID 17587430.

[13] Roughton FJ, Forster RE 1957 Relative importance of diffusion and chemical reaction rates in determining rate of exchange of gases in the human lung, with special reference to true diffusing capacity of pulmonary membrane and volume of blood in the lung capillaries. J Appl Physiol. 11:290-302. PMID 13475180.

[14] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[15] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[16] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[17] One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting

In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang

Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules

Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.

A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running

The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more

There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

[18] Gjedde A. 2010 Diffusive insights: on the disagreement of Christian Bohr and August Krogh Adv Physiol Educ 34: 174-185 PMID 21098384

[19] Krogh A. 1910 On the oxygen metabolism of the blood. Skand Arch Physiol 23: 193–199

[20] Krogh A. 1910 On the mechanism of the gas-exchange in the lungs of the tortoise. Skand Arch Physiol 23: 200–216.

[21] Krogh A. 1910 On the combination of hæmoglobin with mixtures of oxygen and carbonic acid. Skand Arch Physiol 23: 217–223.

[22] Krogh A. 1910 Some experiments on the invasion of oxygen and carbonic oxide into water. Skand Arch Physiol 23: 224–235

[23] Krogh A. 1910 On the mechanism of gas exchange in the lungs. Skand Arch Physiol 23: 248–278

[24] Krogh A, Krogh M. 1910 On the tensions of gases in arterial blood. Skand Arch Physiol 23: 179–192.

[25] Krogh A, Krogh M. 1910 Rate of diffusion into lungs of man. Skand Arch Physiol 23: 236–247

[26] ttp://www.nobelprize.org/nobel_prizes/medicine/laureates/1920/krogh-bio.html

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+{{Infobox diagnostic
+|  Name        = Diffusion capacity
+|  Image       =
+|  Caption     =
+|  ICD10       =
+|  ICD9        =
+|  MeshID      = D011653
+|  OPS301      =
+|  OtherCodes  = CPT: 94720
+}}
+'''Diffusing capacity''' (DL<sub>CO</sub>) is the part of a comprehensive series of tests (the [[Pulmonary function testing|pulmonary function tests]]) that is done to determine the overall ability of the [[lung]] to transport gas into and out of the blood.  DL<sub>CO</sub> is reduced in certain diseases of the lung and heart.  This test has been standardized according to a position paper<ref name="multiple">Macintyre N, Crapo RO, Viegi G, et al. 2005 Standardisation of the single-breath determination of carbon monoxide uptake in the lung. Eur Respir J. 26:720-35 PMID 16204605</ref> by a task force of the [[European Respiratory Society|European Respiratory]] and [[American Thoracic Society|American Thoracic]] Societies.
+In [[respiratory physiology]], the diffusing capacity has a long history of great utility, but the words themselves are now misleading because they are archaic: neither is [[diffusion]] measured nor is the value obtained from this test a [[Battery (electricity)|capacity]] nor even a [[capacitance]], but in fact a [[Electrical resistance and conductance|conductance]]. While the term diffusing capacity is retained in the United States for reasons of historical continuity, terminology using transfer factor is now preferred in Europe and elsewhere.  Nevertheless, there are 7 - 8 times more citations for the original terminology in [[PubMed]], so any change in usage will be slow to happen.
+Worse still, the term diffusing capacity is positively misleading, since gas transport is not diffusion limited in all but the most extreme cases, such as for oxygen uptake at very low ambient oxygen or at very high pulmonary blood flow.  Critics of the term "diffusion capacity" argue that it may be misleading for other reasons as well, and point out two problems with the term. The first is that the test measures not just ''diffusion'' across the alveolar-capillary membrane, but also takes into account factors affecting the chemical combination of a given gas with hemoglobin. The second criticism is that the test is typically measured under submaximal conditions and doesn't truly reflect a functional ''capacity''. For these reasons the term "transfer factor" has been proposed to better reflect the physiological process being measured.<ref name="multiple"/>
+Finally, the diffusing capacity does not directly measure the primary cause of [[hypoxemia]], or low blood oxygen, namely mismatch of [[Ventilation/perfusion ratio|ventilation to perfusion]]:<ref>West, J. 2011. Respiratory Physiology: The Essentials. 9e. ISBN 978-1-60913-640-6</ref>
+* Not all pulmonary arterial blood goes to areas of the lung where gas exchange can occur (the anatomic orphysiologic shunts), and this poorly oxygenated blood rejoins the well oxygenated blood from healthy lung in the pulmonary vein.  Together, the mixture has less oxygen than that blood from the healthy lung alone, and so is hypoxemic.
+* Similarly, not all inspired air goes to areas of the lung where gas exchange can occur (the [[Dead space (physiology)|anatomic and the physiological dead spaces]]), and so is wasted.
+== Calculation ==
+The diffusion capacity for oxygen <math>(D_{L_{O_2}})</math> is the proportionality factor relating the rate of oxygen uptake into the lung to the oxygen gradient between the capillary blood and the alveoli (per [[Fick's laws of diffusion]]). In [[respiratory physiology]], it is convenient to express the transport of gas molecules as changes in volume, since <math>{V_{O_2}}\propto {n_{O_2}}</math> (i.e., in a gas, a volume is proportional to the number of molecules in it).  Further, the oxygen concentration ([[partial pressure]]) in the pulmonary artery is taken to be representative of capillary blood.  Thus, <math>(D_{L_{O_2}})</math> can be calculated as the ratio of the volume of the oxygen taken up by the lung <math>(\dot{V}_{O_{2}})</math> divided by the oxygen gradient between the alveoli ("A") and the pulmonary artery ("a").
+{{NumBlk|::|<math>D_{L_{O_2}} =\frac {\dot{V}_{O_{2}}} {P_{A_{O_2}} - P_{a_{O_2}}} \simeq \frac {\dot{V}_{O_{2}}} {P_{A_{O_2}} - P_{v_{O_2}}}</math>   | {{EquationRef|1}} }}
+::(For <math>\dot{V}</math>, say "V dot".  This is the notation of [[Isaac Newton]] for a first derivative (or rate) and is commonly used in respiratory physiology for this purpose.)
+::::<math>\dot{V}_{O_{2}}</math> is the rate that oxygen is taken up by the lung (ml/min).
+::::<math>P_{A_{O_2}}</math> is the partial pressure of oxygen in the alveoli.
+::::<math>P_{a_{O_2}}</math> is the partial pressure of oxygen in the pulmonary artery.
+::::<math>P_{v_{O_2}}</math> is the partial pressure of oxygen in the systemic veins (where it can actually be measured).
+Thus, the higher the diffusing capacity <math>D_L</math>, the more gas will be transferred into the lung per unit time for a given gradient in partial pressure (or concentration) of the gas.  Since it can be possible to know the alveolar oxygen concentration and the rate of oxygen uptake - but not the oxygen concentration in the pulmonary artery - it is the venous oxygen concentration that is generally employed as a useful approximation in a clinical setting.
+Sampling the oxygen concentration in the pulmonary artery is a highly invasive procedure, but fortunately another similar gas can be used instead that obviates this need. [[Carbon monoxide]] (CO) is tightly and rapidly bound to hemoglobin in the blood, so the partial pressure of CO in the capillaries is negligible and the second term in the denominator can be ignored.  For this reason, CO is generally the test gas used to measure the diffusing capacity and the <math>D_L</math> equation simplifies to:
+{{NumBlk|::|<math>D_{L_{CO}} = \frac {\dot{V}_{CO}} {P_{A_{CO}} }</math>. | {{EquationRef|2}} }}
+== Test Performance ==
+The '''single-breath diffusing capacity test''' is the most common way to determine <math>D_L</math>.<ref name="multiple" /> The test is performed by having the subject blow out all of the air that he/she can, leaving only the [[Lung volumes|residual lung volume]] of gas.  The person then inhales a test gas mixture rapidly and completely, reaching the [[Lung volumes|total lung capacity]] as nearly as possible. This test gas mixture contains a small amount of carbon monoxide (usually 0.3%) and a ''tracer gas'' that is freely distributed throughout the alveolar space but which doesn't cross the alveolar-capillary membrane.  Helium and methane are two such gasses.  The test gas is held in the lung for about 10 seconds during which time the CO (but ''not'' the tracer gas) continuously moves from the alveoli into the blood.  Then the subject exhales.
+The anatomy of the airways brings with it complications, since the inspired air must pass through the mouth, trachea, bronchi and bronchioles before it gets to the alveoli where gas exchange will occur; on exhalation, alveolar gas must return along the same path, and so the exhaled sample will be purely alveolar only after a 500 to 1,000 ml of gas has left the subject.  While it is algebraically possible to approximate the effects of anatomy (the ''three-equation method''<ref>Graham BL, Mink JT, Cotton DJ. 1981. Improved accuracy and precision of single-breath CO diffusing capacity measurements. ''J Appl Physiol''. 51:1306-13. PMID 7298468</ref>), disease states introduce considerable uncertainty to this approach. Instead, the first 500 to 1,000 ml of the expired gas is disregarded and the next portion which contain gas that has been in the alveoli is analyzed.<ref name="multiple" /> By analyzing the concentrations of carbon monoxide and inert gas in the inspired gas and in the exhaled gas, it is possible to calculate <math>(D_{L_{CO}})</math> according to Equation {{EquationRef|2}}. First, the ''rate'' at which CO is taken up by the lung is calculated according to:
+{{NumBlk|::|<math>\dot{V}_{CO} =\frac {\Delta{[CO]} * V_A} {\Delta{t}} </math> . | {{EquationRef|4}} }}
+::::The pulmonary function equipment monitors the change in the concentration of CO that occurred during the breath hold, <math>\Delta{[CO]}</math>, and also records the time <math>\Delta{t}</math>.
+::::The volume of the alveoli, <math>V_A</math>, is determined by the degree to which the tracer gas has been diluted by inhaling it into the lung.
+Similarly,
+{{NumBlk|::|<math>P_{A_{CO}} = V_B * F_{A_{CO_{O}}}  </math> . | {{EquationRef|5}} }}
+where
+::::<math>F_{A_{CO_{O}}}</math> is the initial alveolar fractional CO concentration, as calculated by the dilution of the tracer gas.
+::::<math>V_B</math> is the barometric pressure
+Other methods that are not so widely used at present can measure the diffusing capacity.  These include the steady state diffusing capacity that is performed during regular tidal breathing, or the rebreathing method that requires rebreathing from a reservoir of gas mixtures.
+== Interpretation ==
+In general, a healthy individual has a value of <math>D_{L_{CO}}</math> between 75% and 125% of the average.<ref name=uppsala>LUNGFUNKTION - Practice compendium for semester 6. Department of Medical Sciences, Clinical Physiology, Academic Hospital, Uppsala, Sweden. Retrieved 2010.</ref> However, individuals vary according to age, sex, height and a variety of other parameters.  For this reason, reference values have been published, based on populations of healthy subjects<ref>Miller A, Thornton JC, Warshaw R, Anderson H, Teirstein AS, Selikoff IJ. 1983 Single breath diffusing capacity in a representative sample of the population of Michigan, a large industrial state. Predicted values, lower limits of normal, and frequencies of abnormality by smoking history. Am Rev Respir Dis. 127:270-7. PMID 6830050.</ref><ref>Knudson RJ, Kaltenborn WT, Knudson DE, Burrows B. 1987 The single-breath carbon monoxide diffusing capacity. Reference equations derived from a healthy nonsmoking population and effects of hematocrit. Am Rev Respir Dis. 135:805-11. PubMed PMID 3565929.</ref><ref>Cotes JE, Chinn DJ, Quanjer PhH, Roca J, Yernault JC. 1993 Standardization of the measurement of transfer factor (Diffusing capacity). Eur Respir J Suppl 16:41–52. PMID 8499053</ref> as well as measurements made at altitude,<ref>Crapo RO, Morris AH, Gardner RM. 1982 Reference values for pulmonary tissue volume, membrane diffusing capacity, and pulmonary capillary blood volume. Bull Eur Physiopathol Respir. 18:893-9. PMID 6927541.</ref> for children<ref>Koopman M, Zanen P, Kruitwagen CL, van der Ent CK, Arets HG. 2011 Reference values for paediatric pulmonary function testing: The Utrecht dataset. Respir Med. 105:15-23. Erratum in: Respir Med. 2011 105:1970-1. PMID 20889322.</ref> and some specific population groups.<ref>Chin NK, Ng TP, Hui KP, Tan WC. 1997 Population based standards for pulmonary function in non-smoking adults in Singapore. Respirology. 1997 Jun;2(2):143-9. PMID 9441128.</ref><ref>Piirilä P, Seikkula T, Välimäki P. 2007 Differences between Finnish and European reference values for pulmonary diffusing capacity. Int J Circumpolar Health. 66:449-57. PubMed PMID 18274210.</ref><ref>Ip MS, Lam WK, Lai AY, ''et al.'' Hong Kong Thoracic Society. Reference values of diffusing capacity of non-smoking Chinese in Hong Kong. Respirology. 12:599-606. PMID 17587430.</ref>
+===Blood CO levels may not be negligible===
+In heavy smokers, blood CO is great enough to influence the measurement of <math>D_{L_{CO}}</math>, and requires an adjustment of the calculation when COHb is greater than 2% of the whole.
+====The two components of <math>D_{L_{CO}}</math>====
+While <math>(D_L)</math> is of great practical importance, being the overall measure of gas transport, the interpretation of this measurement is complicated by the fact that it does not measure any one part of a multi-step process. So as a conceptual aid in interpreting the results of this test, the time needed to transfer CO from the air to the blood can be divided into two parts.  First CO crosses the alveolar capillary membrane (represented by <math>D_M</math> ) and then CO combines with the hemoglobin in capillary red blood cells at a rate <math>\theta</math> times the volume of capillary blood present (<math>V_c</math>).<ref>Roughton FJ, Forster RE 1957 Relative importance of diffusion and chemical reaction rates in determining rate of exchange of gases in the human lung, with special reference to true diffusing capacity of pulmonary membrane and volume of blood in the lung capillaries. ''J Appl Physiol''. 11:290-302. PMID 13475180.</ref> Since the steps are in series, the conductances add as the sum of the reciprocals:
+{{NumBlk|::|<math>\frac {1} {D_{L_{CO}}} =\frac {1} {D_M} + \frac {1} {\theta * V_c}</math> .  | {{EquationRef|3}} }}
+====Any change in <math>V_c</math> alters <math>D_{L_{CO}}</math>====
+The volume of blood in the lung capillaries, <math>V_c</math>, changes appreciably during ordinary activities such as [[Physical exercise|exercise]].  Simply breathing in brings some additional blood ''into'' the lung because of the negative intrathoracic pressure required for inspiration.  At the extreme, inspiring against a closed glottis, the [[Müller's maneuver]], pulls blood ''into'' the chest.  The opposite is also true, as exhaling increases the pressure within the thorax and so tends to push blood out; the [[Valsalva maneuver]] is an exhalation against a closed airway which can move blood ''out'' of the lung. So breathing hard during exercise will bring extra blood into the lung during inspiration and push blood out during expiration. But during exercise (or more rarely when there is a [[Atrioventricular septal defect|structural defect]] in the heart that allows blood to be shunted from the high pressure, systemic circulation to the low pressure, pulmonary circulation) there is also increased blood flow throughout the body, and the lung adapts by recruiting extra capillaries to carry the increased output of the heart, further increasing the quantity of blood in the lung.  Thus <math>D_{L_{CO}}</math> will appear to increase when the subject is not at rest, particularly during inspiration.
+In disease, [[Pulmonary hemorrhage|hemorrhage]] into the lung will increase its hemoglobin content, and so increase <math>D_{L_{CO}}</math>.
+Finally, <math>V_c</math> is increased in '''[[obesity]]''' and when the subject lies down, both of which increase the blood in the lung by compression and by gravity and thus both increase <math>D_{L_{CO}}</math>.
+====Reasons why <math>\theta</math> varies====
+The rate of CO uptake into the blood, <math>\theta</math>, depends on the concentration of hemoglobin in that blood, abbreviated [[Hemoglobin|Hb]] in the CBC ([[Complete Blood Count]]).  More hemoglobin is present in [[polycythemia]], and so <math>D_{L_{CO}}</math> is elevated.  In [[anemia]], the opposite is true.  In environments with high levels of CO in the inhaled air (such as [[smoking]]), a fraction of the blood's hemoglobin is rendered ineffective by its tight binding to CO, and so is analogous to anemia.  It is recommended that <math>D_{L_{CO}}</math> be adjusted when blood CO is high.<ref name="multiple" />
+The lung blood volume is also reduced when blood flow is interrupted by blood clots ([[pulmonary emboli]]) or reduced by bone deformities of the thorax, for instance [[scoliosis]] and [[kyphosis]].
+Varying the ambient concentration of oxygen also alters <math>\theta</math>.  At high altitude, inspired oxygen is low and more of the blood's hemoglobin is free to bind CO; thus <math>\theta</math> is increased and <math>D_{L_{CO}}</math> appears to be increased.  Conversely, supplemental oxygen increases Hb saturation, decreasing <math>\theta</math> and <math>D_{L_{CO}}</math>.
+====Lung diseases that reduce <math>D_M</math> and <math>\theta * V_c</math>====
+Diseases that alter lung tissue reduce both <math>D_M</math> and <math>\theta * V_c</math> to a variable extent, and so decrease <math>D_{L_{CO}}</math>.
+# Loss of lung parenchyma in diseases like [[emphysema]].
+# Diseases that scar the lung (the [[interstitial lung disease]]), such as [[idiopathic pulmonary fibrosis]], or [[sarcoidosis]]
+# Swelling of lung tissue ([[pulmonary edema]]) due to [[heart failure]], or due to an acute inflammatory response to allergens ([[acute interstitial pneumonitis]]).
+# Diseases of the blood vessels in the lung, either inflammatory ([[Vasculitis|pulmonary vasculitis]]) or hypertrophic ([[pulmonary hypertension]]).
+====Lung conditions that increase <math>D_{L_{CO}}</math>.====
+# Alveolar hemorrhage [[Goodpasture's syndrome]],<ref>{{cite journal|last=Greening|first=AP|coauthors=Hughes, JM|title=Serial estimations of carbon monoxide diffusing capacity in intrapulmonary haemorrhage.|journal=Clinical science (London, England : 1979)|date=May 1981|volume=60|issue=5|pages=507–12|pmid=7249536}}</ref> [[polycythemia]],<ref>{{cite journal|last=Burgess|first=J. H.|coauthors=Bishop, J. M.|title=PULMONARY DIFFUSING CAPACITY AND ITS SUBDIVISIONS IN POLYCYTHEMIA VERA|journal=Journal of Clinical Investigation|volume=42|issue=7|pages=997–1006|doi=10.1172/JCI104804|accessdate=4 August 2013|pmc=289367}}</ref> left to right [[Cardiac shunt|intracardiac shunts]],<ref>{{cite journal|last=AUCHINCLOSS JH|first=Jr|coauthors=GILBERT, R; EICH, RH|title=The pulmonary diffusing capacity in congenital and rheumatic heart disease.|journal=Circulation|date=February 1959|volume=19|issue=2|pages=232–41|pmid=13629784}}</ref> due increase in volume of blood exposed to inspired gas.
+# [[Asthma]] due to better perfusion of apices of lung. This is caused by increase in pulmonary arterial pressure and/or due to more negative pleural pressure generated during inspiration due to bronchial narrowing.<ref>{{cite journal|last=Collard|first=P|coauthors=Njinou, B; Nejadnik, B; Keyeux, A; Frans, A|title=Single breath diffusing capacity for carbon monoxide in stable asthma.|journal=Chest|date=May 1994|volume=105|issue=5|pages=1426–9|pmid=8181330}}</ref>
+==History==
+In one sense, it is remarkable that DL<sub>CO</sub> has retained such clinical utility.  The technique was invented to settle one of the great controversies of pulmonary physiology a century ago, namely the question of whether oxygen and the other gases were actively transported into and out of the blood by the lung, or whether gas molecules diffused passively.<ref>Gjedde A. 2010 [http://advan.physiology.org/content/34/4/174.full#content-block Diffusive insights: on the disagreement of Christian Bohr and August Krogh ] Adv Physiol Educ 34: 174-185 PMID 21098384</ref> Remarkable too is the fact that both sides used the technique to gain evidence for their respective hypotheses. To begin with, [[Christian Bohr]] invented the technique, using a protocol analogous to the steady state diffusion capacity for carbon monoxide, and concluded that oxygen was actively transported into the lung.  His student, [[August Krogh]] developed the single breath diffusion capacity technique along with his wife [[August Krogh|Marie]], and convincingly demonstrated that gasses diffuse passively,<ref>Krogh A. 1910 On the oxygen metabolism of the blood. Skand Arch Physiol 23: 193–199</ref><ref>Krogh A. 1910 On the mechanism of the gas-exchange in the lungs of the tortoise. Skand Arch Physiol 23: 200–216.</ref><ref>Krogh A. 1910 On the combination of hæmoglobin with mixtures of oxygen and carbonic acid. Skand Arch Physiol 23: 217–223.</ref><ref>Krogh A. 1910 Some experiments on the invasion of oxygen and carbonic oxide into water. Skand Arch Physiol 23: 224–235</ref><ref>Krogh A. 1910 On the mechanism of gas exchange in the lungs. Skand Arch Physiol 23: 248–278</ref><ref>Krogh A, Krogh M. 1910 On the tensions of gases in arterial blood. Skand Arch Physiol 23: 179–192.</ref><ref>Krogh A, Krogh M. 1910 Rate of diffusion into lungs of man. Skand Arch Physiol 23: 236–247</ref> a finding that led to the demonstration that capillaries in the blood were recruited into use as needed - a Nobel prize winning idea.<ref>http://www.nobelprize.org/nobel_prizes/medicine/laureates/1920/krogh-bio.html</ref>
+==References==
+{{Reflist}}
+==Further reading==
+* Mason RJ, Broaddus VC, Martin T, King T,Jr., Schraufnagel D, Murray JF, Nadel JA. (2010) Textbook of Respiratory Medicine. 5e. ISBN 978-1-4160-4710-0.
+* Ruppel, G. L. (2008) Manual of Pulmonary Function Testing. 9e. ISBN 978-0-323-05212-2.
+* West, J. (2011) Respiratory Physiology: The Essentials. 9e. ISBN 978-1-60913-640-6.
+* West, J. (2012) Pulmonary Pathophysiology: The Essentials. 8e. ISBN 978-1-4511-0713-5.
+*
+== External links ==
+* {{MeshName|Pulmonary+diffusing+capacity}}
+* {{MedlinePlusEncyclopedia|003854}}
+* [http://www.rcjournal.com/cpgs/ American Association for Respiratory Care ''Clinical Practice Guidelines'']
+* [http://the-aps.org The American Physiological Society home page]
+* [http://thoracic.org The American Thoracic Society home page]
+* [http://ersnet.org The European Respiratory Society home page]
+{{Respiratory system procedures}}
+[[Category:Respiratory physiology]]
+[[de:Kohlenmonoxid-Transferfaktor]]
+[[pl:Badanie zdolności dyfuzji gazów w płucach]]

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Revision as of 02:21, 8 August 2013

Contents

Calculation

Test Performance

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New Balance Schuhe Squidquest..

Interpretation

Blood CO levels may not be negligible

The two components of $D_{L_{C O}}$

Any change in $V_{c}$ alters $D_{L_{C O}}$

Reasons why $θ$ varies

Lung diseases that reduce $D_{M}$ and $θ * V_{c}$

Lung conditions that increase $D_{L_{C O}}$ .

History

References

Further reading

External links

Navigation menu

Examples of Markov chains: Difference between revisions

Revision as of 02:21, 8 August 2013

Calculation

Test Performance

Beats Headphones Australia Mack

Nike Free Run Australia Lipitor

Pandora Jewelry Australia where you want

Mbt Australia and points of view they present..

Mont Blanc Pens Sydney But now

Oakley Sunglasses ..

Nike Air Max 1 es ist lustig

Hollister Berlin Muskelschwäche

Louis Vuitton Online Shop Die xtron prangt Android 4.1

Belstaff Schweiz als ob sie wissen

Peuterey Jacken S盲uglinge k枚nnen verlangen

New Balance Schuhe Squidquest..

Interpretation

Blood CO levels may not be negligible

The two components of DLCO

Any change in Vc alters DLCO

Reasons why θ varies

Lung diseases that reduce DM and θ*Vc

Lung conditions that increase DLCO.

History

References

Further reading

External links

Navigation menu

Search

The two components of $D_{L_{C O}}$

Any change in $V_{c}$ alters $D_{L_{C O}}$

Reasons why $θ$ varies

Lung diseases that reduce $D_{M}$ and $θ * V_{c}$

Lung conditions that increase $D_{L_{C O}}$ .