COPD diagnosis was confirmed by medical history and the results of spirometry. American Thoracic ... 1 = 80% of the predictive value, an FEV 1 /FVC ratio = 70%, and a reversibility in FEV 1 ...

Functional residual capacity (FRC) is the volume of air left in your lungs after a normal, passive exhalation. This test is used to evaluate your lung function, and you may need to have your FRC ...