Forced expiratory volume (FEV) measures how much air a person can exhale during a forced breath. The amount of air exhaled may be measured during the first (FEV1), second (FEV2), and/or third seconds (FEV3) of the forced breath.
Forced vital capacity (FVC) is the total amount of air exhaled during the FEV test.
Forced expiratory volume and forced vital capacity are lung function tests that are measured during spirometry. Forced expiratory volume is the most important measurement of lung function. It is used to:
Author: Healthwise Staff Medical Review: E. Gregory Thompson MD - Internal Medicine Anne C. Poinier MD - Internal Medicine Adam Husney MD - Family Medicine Robert L. Cowie MB, FCP(SA), MD, MSc, MFOM - Pulmonology Elizabeth T. Russo MD - Internal Medicine
Medical Review:E. Gregory Thompson MD - Internal Medicine & Anne C. Poinier MD - Internal Medicine & Adam Husney MD - Family Medicine & Robert L. Cowie MB, FCP(SA), MD, MSc, MFOM - Pulmonology & Elizabeth T. Russo MD - Internal Medicine