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How can methacholine challenge test (MCT) help diagnose asthma?

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Methacholine challenge test is a type of lung function test that’s commonly used to diagnose asthma. During this test, you inhale increasing amounts of a mist of methacholine before and after spirometry, a related test that measures how much and how fast you can blow air out of your lungs. If your lung function drops by 20% or more after a low dose of methacholine, that shows you have asthma.

SOURCES: National Institutes of Health web site: "Asthma." American Academy of Allergy, Asthma, and Immunology web site: "Patient Gallery: Other diseases related to asthma."  National Asthma Education and Prevention Program: "Considerations for Diagnosing and Managing Asthma in the Elderly" and "Guidelines for the Diagnosis and Management of Asthma." American Lung Association web site: "Asthma in Adults Fact Sheet."



Reviewed by Carol DerSarkissian on February 28, 2018

SOURCES: National Institutes of Health web site: "Asthma." American Academy of Allergy, Asthma, and Immunology web site: "Patient Gallery: Other diseases related to asthma."  National Asthma Education and Prevention Program: "Considerations for Diagnosing and Managing Asthma in the Elderly" and "Guidelines for the Diagnosis and Management of Asthma." American Lung Association web site: "Asthma in Adults Fact Sheet."



Reviewed by Carol DerSarkissian on February 28, 2018

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How can diffusing capacity (DLCO) test help with the diagnosis of asthma?

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