What Are the 4 Stages of COPD? What Your Results Mean
💡TL;DR: COPD has 4 stages based on how much air you blow out in 1 second (FEV1) after a bronchodilator: ≥80% (mild), 50–79% (moderate), 30–49% (severe), and <30% (very severe). GOLD 2024 also groups people by symptoms and flare-up risk (A, B, E) to fine-tune treatment.