Description of modified Global Initiative on Obstructive Lung Disease categories
| Category | Description |
|---|---|
| FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; GOLD, Global Initiative on Obstructive Lung Disease; LLN, lower limit of normal. | |
| *The categories in bold comprise the “potentially overdiagnosed” group of individuals. | |
| Normal | FEV1/FVC ⩾0.7, FVC, (%) >80 and asymptomatic |
| GOLD 0 | FEV1/FVC ⩾0.7, FVC, (%) ⩾80 and symptomatic |
| Restricted | FEV1/FVC ⩾0.7, FVC, (%) <80 |
| GOLD 1 (⩾LLN) | FEV1/FVC <0.7, FEV1, (%) ⩾80 and FEV1/FVC ⩾LLN |
| GOLD 1 (<LLN) | FEV1/FVC <0.7, FEV1, (%) ⩾80 and FEV1/FVC <LLN |
| GOLD 2 (⩾LLN) | FEV1/FVC <0.7, 80>FEV1, (%) ⩾50 and FEV1/FVC ⩾LLN |
| GOLD 2 (<LLN) | FEV1/FVC <0.7 and 80>FEV1, (%) ⩾50 and FEV1/FVC <LLN |
| GOLD 3 or 4 (⩾LLN) | FEV1/FVC <0.7, FEV1, (%) <50 and FEV1/FVC ⩾LLN |
| GOLD 3 or 4 (<LLN) | FEV1/FVC <0.7, FEV1, (%) <50 and FEV1/FVC <LLN |