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

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  • Diffusing capacity (DLCO). This simple test includes a 10-second breath hold to determine how well the lungs take up oxygen from the lungs. The DLCO is normal in people with asthma and low in smokers who have COPD.

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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