forced expiratory volume Forced Expiratory Volume in 1 Second Pulmonary Function Test/Forced Expiratory Volume 1 Forced_Expiratory_Volume_1_Test CDISC FEV1 FEV1%VC PCDC The volume of air that can be forcibly exhaled during the first second following maximal inhalation. PFT/FEV1 C38084 Forced Expiratory Volume in 1 Second A test of lung function, the FEV1 is the volume exhaled during the first second of a forced expiratory maneuver started from the level of total lung capacity. It is the most frequently used index for assessing bronchoconstriction or bronchodilatation. Forced Expiratory Volume in 1 Second C0849974 Forced Expiratory Volume 1 Test Diagnostic Procedure