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
spirometry. Forced expiratory volume is the most
important measurement of lung function. It is used to: