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Table 1 Spirometric Classification of COPD Severity.

From: Early detection of COPD in primary care -The Copenhagen COPD Screening Project

Based on Post-Bronchodilator FEV1
Stage I: Mild FEV1/FVC < 0,70
FEV1 ≥ 80% predicted
Stage II: Moderate FEV1/FVC < 0,70
50% ≤ FEV1 < 80% predicted
Stage III: Severe FEV1/FVC < 0,70
30% ≤ FEV1 < 50% predicted
Stage IV: Very Severe FEV1/FVC < 0,70
FEV1 < 30% predicted or
FEV1 < 50% predicted plus
chronic respiratory failure