Source:http://linkedlifedata.com/resource/umls/id/C0849974
NCI: 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. (from http://www.spirxpert.com/indices7.htm)