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Diffusing capacity Article
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Diffusing capacity pulmonary-function-tests
Definition
Lung diffusion testing is used to determine how well oxygen passes from the air sacs of the lungs into the blood. The test measures the "diffusing capacity of the lung for carbon monoxide" or DLCO.
Alternative Names
Diffusing capacity; DLCO test
Why the Diffusing capacity is Performed
The test is used to diagnose the presence and extent of certain lung diseases. It may also be used to see how gases move the lungs into the bloodstream.
How the Diffusing capacity is Performed
You breath in (inhale) some gas containing a very small quantity of carbon monoxide, hold your breath for 10 seconds, then rapidly blow it out (exhale). The single exhaled gas is analyzed to determine how much carbon monoxide was absorbed during the breath.
How to Prepare for the Diffusing capacity
Do not eat a heavy meal before the test. Do not smoke for at least 4 - 6 hours prior to the test. If you use a bronchodilator or inhaler medications, ask your health care provider whether or not you can use them before the test.
How the Diffusing capacity Will Feel
The mouth piece fits tightly around your mouth. Clips are put on the nose.
Risks
There are no significant risks.
Considerations
Other pulmonary function tests may be done in combination with this test.
Normal Results
Normal test results depend on a person's age, sex, and height.
What Abnormal Results Mean
Abnormal results generally mean that gases do not move normally across the lung tissues. This may mean that lung diseases, such as interstitial fibrosis, sarcoidosis, asbestosis, and emphysema, are present.
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