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Forced Expiratory Volume in 1 Second
Definition 1
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. (NCI Thesaurus)
Definition 2
The volume of air that a subject can breathe out during the first second of exhalation after maximum inhalation. (NCI Thesaurus/CDISC)
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