Forced Expiratory Volume in 0.05 Second to FVC Ratio Measurement

**Semantic type:** Diagnostic Procedure

**Definition:** The ratio of the volume of gas that is forcibly exhaled during the first 0.05 seconds following maximal inhalation to that of the forced vital capacity.

**Synonyms:** - EV_05FVC - Forced Expiratory Volume in 0.05 S/FVC - Forced Expiratory Volume in 0.05 S/FVC - Forced Expiratory Volume in 0.05 Seconds over FVC