1. Health

Definition of Forced Expiratory Volume in One Second (FEV1)


Updated April 29, 2014


Spirometry Test

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%
  1. About.com
  2. Health
  3. COPD
  4. Glossary of Terms
  5. COPD Glossary F - K
  6. Forced Expiratory Volume in One Second - Definition

©2014 About.com. All rights reserved.

We comply with the HONcode standard
for trustworthy health
information: verify here.