Question

According to the GOLD criteria, very severe COPD is defined by:

• A. FEV1/FVC < 70 and FEV1 < 30
• B. FEV1/FVC < 70 and FEV1 < 70
• C. FEV1/FVC < 70 and FEV1 < 50
• D. Both A and C

Hint:

Very severe means FEV1 below 30 percent predicted with an obstructive ratio.

Answer 1

The Correct Option is A

Step 1: The diagnosis of COPD requires a post-bronchodilator \(\text{FEV}_1/\text{FVC} \lt 0.70\), which confirms persistent airflow limitation.

Step 2: GOLD staging then uses the FEV1 percent predicted. Stage IV (very severe) is defined as \(\text{FEV}_1/\text{FVC} \lt 70\%\) with \(\text{FEV}_1 \lt 30\%\) predicted, or FEV1 < 50% predicted plus chronic respiratory failure.

Step 3: The cleanest spirometric definition of very severe COPD among the options is FEV1/FVC < 70 and FEV1 < 30, so option A is correct.