Spirometric classification of chronic obstructive pulmonary disease (COPD)

Severity of obstructionPost-bronchodilator FEV1/FVCFEV1 % predicted
At risk>0.7≥80
Mild COPD≤0.7≥80
Moderate COPD≤0.750–80
Severe COPD≤0.730–50
Very severe COPD≤0.7<30
  • FEV1: forced expiratory volume in 1 s; FVC: forced vital capacity. At risk are patients who: smoke or have exposure to pollutants; have cough, sputum or dyspnoea; and have a family history of chronic respiratory disease.