What FEV1/FVC ratio after bronchodilator confirms airflow obstruction in the diagnosis of COPD?
Answer and explanation
Correct answer: A. Below 0.7
- Step 1: Spirometry is needed to diagnose COPD in a symptomatic smoker. Step 2. A post-bronchodilator ratio below 0.7 confirms obstruction that is not fully reversible. Answer: Below 0.7. Why not the others: Ratios above 0.8 are normal or suggest restriction.
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