Table 30.1.
Global Initiative for Obstructive Lung Disease (GOLD) criteria for COPD severity based upon spirometry5
| FEV1/FVC (%) | FEV1 (% PREDICTED) | |
|---|---|---|
| 1 | <70 | >80 |
| 2 | <70 | 50–80 |
| 3 | <70 | 30–50 |
| 4 | <70 | <30 |
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