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Stages of COPD: Mild through End-Stage COPD | Lung Institute

Moderate COPD or Stage 2—Moderate COPD with a FEV1 between 50 and 80 percent of normal. Severe COPD or Stage 3—Severe emphysema with a FEV1 between 30 and 50 percent of normal. Very Severe COPD or Stage 4—Very severe or End-Stage COPD with a lower FEV1 than Stage 3, or people with low blood oxygen levels and a Stage 3 FEV1.