Forced Expiratory Volume in 3 Seconds to Forced Vital Capacity Ratio Measurement

**Semantic type:** Diagnostic Procedure

**Definition:** A relative measurement (ratio or percentage) of the forced expiratory volume during the first three seconds of exhalation to the largest observed expired volume during a forced vital capacity maneuver.

**Synonyms:** - FEV3/FVC - FEV3/FVC - FEV3/FVC - FEV3FVC