Algorithm for pulmonary function test interpretation

COPD: chronic obstructive pulmonary disease; DLCO: diffusing capacity for carbon monoxide; FEV₁: forced expiratory volume in one second; FVC: forced vital capacity; VC: vital capacity; ILD: interstitial lung disease.

* Bronchoprovocation testing uses a variety of challenges (eg, methacholine, mannitol, exercise, isocapnic hyperpnea) to assess airway hyperresponsiveness.