Forced Expiratory Volume

**Definition:** Measure of the maximum amount of air that can be expelled in a given number of seconds during a FORCED VITAL CAPACITY determination . It is usually given as FEV followed by a subscript indicating the number of seconds over which the measurement is made, although it is sometimes given as a percentage of forced vital capacity.

**Tree numbers:** - E01.370.386.700.660.230 - G09.772.650.430

**Synonyms:** - Forced Vital Capacity, Timed - Timed Vital Capacity - Vital Capacity, Timed - FEVt