What is the role of pulmonary function tests in the evaluation of chronic obstructive pulmonary disease (COPD)?

Updated: Nov 13, 2020
  • Author: Paul Kleinschmidt, MD; Chief Editor: Barry E Brenner, MD, PhD, FACEP  more...
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Forced expiratory volume in 1 second (FEV1) is decreased, with concomitant reduction in FEV1/forced vital capacity (FVC) ratio. Patients have poor/absent reversibility with bronchodilators. FVC is normal or reduced. Total lung capacity (TLC) is normal or increased. Residual volume (RV) is increased. Diffusing capacity is normal or reduced.

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