WebFEV–1 less than 40 percent of predicted value, or; the ratio of Forced Expiratory Volume in one second to Forced Vital Capacity (FEV–1/FVC) less than 40 percent, or; Diffusion Capacity of the Lung for Carbon Monoxide by the Single Breath Method (DLCO (SB)) less than 40-percent predicted, or; maximum exercise capacity less than 15 ml/kg/min ... WebJul 29, 2024 · If either of these are larger than the FVC, then they should be substituted for the FVC and the FEV1/FVC ratio re-calculated accordingly. Doing this often reveals airway obstruction that was not evident using the FVC from the spirometry effort alone. 16. Using FEF25-75 (aka MMEF) FEF25-75 is the measurement that will not die.
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