Table 1—

Diagnosis and staging of chronic obstructive pulmonary disease(COPD)#

SeverityFEV1/FVC %FEV1 % pred
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 one second; FVC: forced vital capacity. All values are based on post-bronchodilator FEV1. #: recommended spirometry thresholds of Global Initiative for Chronic Obstructive Lung Disease 2003 5 and American Thoracic Society/European Respiratory Society COPD guidelines 2004 6; : patients who smoke or have exposure to pollutants, have cough, sputum or dyspnoea, or have a family history of respiratory disease.