3: COPD Severity Classification

Question 1

Which stage?

FEV₁ < 30% of predicted

Answer 1

Stage 4: Very Severe

Question 2

Which stage?

FEV₁ 30–49% of predicted

Answer 2

Stage 3: Severe

Question 3

Which stage?

FEV₁ < 50% of predicted plus chronic respiratory failure present

Answer 3

Stage 4: Very Severe

Question 4

Which stage?

FEV₁ ≥ 80% of predicted

Answer 4

Stage 1: Mild

Question 5

Which stage?

FEV₁/FVC < 70%

Answer 5

• Stage 1: Mild
• Stage 2: Moderate
• Stage 3: Severe

Question 6

Which stage?

FEV₁ 50–79% of predicted

Answer 6

Stage 2: Moderate