Postbronchodilator FEV1/FVC | FEV1% predicted | NICE 2004 | ATS/ERS 2004 | GOLD 2008 | NICE 2010 | ||
Severity of airflow obstruction | |||||||
Postbronchodilator | Postbronchodilator | Postbronchodilator | |||||
<0.7 | ≥80 | Mild | Stage 1: Mild | Stage 1: Mild* | |||
<0.7 | 50–79 | Mild | Moderate | Stage 2: Moderate | Stage 2: Moderate | ||
<0.7 | 30–49 | Moderate | Severe | Stage 3: Severe | Stage 3: Severe | ||
<0.7 | <30 | Severe | Very severe | Stage 4: Very severe† | Stage 4: Very severe† |
↵* Symptoms should be present to diagnose chronic obstructive pulmonary disease in people with mild airflow obstruction.
↵† Or FEV1 <50% with respiratory failure.
ATS, American Thoracic Society; ERS, European Respiratory Society; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; GOLD, Global Initiative for Chronic Obstructive Lung Disease; NICE, National Institute for Health and Clinical Excellence.