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Definition of Forced Expiratory Volume in One Second (FEV1)

By Deborah Leader, RN, About.com

Updated December 19, 2008

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spirometry

Spirometry Test

A.D.A.M.
Definition: The amount of air which can be forcibly exhaled from the lungs in the first second of a forced exhalation. Measuring FEV1 is done through spirometry testing which helps your doctor determine your lung function.

Because COPD causes the air in your lungs to be exhaled at a slower rate and in a smaller amounts compared to a normal, healthy person, measuring how well you can forcibly exhale air can help determine the presence of COPD.

Also Known As: FEV1, FEV1%
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