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What are gas and diffusion tests, and how can they help me if I have asthma?

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Even if your lung function tests are normal, your doctor may order gas and diffusion tests to see what could be causing your asthma symptoms. Gas and diffusion tests can measure how well your blood absorbs oxygen and other gases from the air you breathe. You breathe in a small amount of a gas, hold your breath, then blow out. The gas you exhale is analyzed to see how much your blood absorbed.

From: Asthma and Lung Function Tests WebMD Medical Reference

SOURCES: American Academy of Asthma, Allergy, and Immunology: "What to expect at the doctor's office."  American Lung Association: "Spirometry and Other Lung Function Tests Fact Sheet."  American Medical Association: .  Asthma and Allergy Foundation of America: "Peak Flow Meters." Grayson, M. 2005 National Asthma Education and Prevention Program: "Expert Panel Report 3: Guidelines for the Diagnosis and Management of Asthma -- 2002."  National Heart, Lung and Blood Institute: "Asthma: How is Asthma Diagnosed?"  MedlinePlus: "Pulmonary Function Tests."  National Lung Health Education Program: "Spirometry."







Essential Guide to AsthmaACP Medicine, .

Reviewed by Dan Brennan on August 18, 2019

SOURCES: American Academy of Asthma, Allergy, and Immunology: "What to expect at the doctor's office."  American Lung Association: "Spirometry and Other Lung Function Tests Fact Sheet."  American Medical Association: .  Asthma and Allergy Foundation of America: "Peak Flow Meters." Grayson, M. 2005 National Asthma Education and Prevention Program: "Expert Panel Report 3: Guidelines for the Diagnosis and Management of Asthma -- 2002."  National Heart, Lung and Blood Institute: "Asthma: How is Asthma Diagnosed?"  MedlinePlus: "Pulmonary Function Tests."  National Lung Health Education Program: "Spirometry."







Essential Guide to AsthmaACP Medicine, .

Reviewed by Dan Brennan on August 18, 2019

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