FVC, peak expiratory flow (PEF), and FIF max can be read directly from a flow volume loop graph while the forced expiratory volume at one second (FEVI) and forced expiratory flow
between 25 and 75% of vital capacity (FEF 25-75)), and FIF, all need to be calculated or read from a time volume curve.
Individual diagnoses of asthma were established according to spirometry testing: forced vital capacity, forced expiratory volume in one second and forced expiratory flow
66 82 DLCO (mL/min/mmHg) TLC (L) RV(L) FVC = forced vital capacity FEV1 = forced expiratory volume in 1 second FEF25-75 = forced expiratory flow
25-75% PEF = peak expiratory flow TLC = total lung capacity RV = residual volume DLCO = diffusion capacity of lungs for carbon monoxide pre-Rx = before bronchodilator post-Rx = after bronchodilator % Pred = percent of predicted value L = liters, mL = milliliters mm = millimeters Hg = mercury sec = second, min = minute
For this study, multiple lung function tests were performed and significant changes were noted in four measurements: the FVC, or forced vital capacity, which reflects the volume of air that can be blown out after fully inhaling; the FEV1, or forced expiratory volume in 1 second, which is the volume of air that can forcibly be blown out in one second, after fully inhaling; the FEF, or forced expiratory flow
, which reflects the flow of air coming out of the lungs during the middle portion of a forced exhalation; and the PEF, or peak expiratory flow, which is the maximal flow achieved when air is forcibly exhaled immediately after being inhaled.