What is FEF 25-75 percent?

Answer 1

100

Answer 2

Forced expiratory flow at 25% point to the 75% point of Forced Vital Capacity, a technique that assess exhalation of an individual to help characterize their lung disease. FEF 25-75 is one of many pulmonary function tests, FEV1 being the most common.

some other examples: FVC, FEV1, DLCO, and TLC, FEV1/FVC, FEF 25-75 percent, FEF 50 percent, FEF 75 percent, FEF 75 to 85 percent, FEV3/FVC percent


Important reason why FEV1 is used more than FEF25-75 from
"FEF25-75% is the average expired flow over the middle half of the FVC manoeuvre and is regarded as a more sensitive measure of small airways narrowing than FEV1. Unfortunately FEF25-75% has a wide range of normality, is less reproducible than FEV1, and is difficult to interpret if the VC (or FVC) is reduced or increased." -