What are the best tests to diagnose COPD?
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Spirometry is the gold standard test used in diagnosing chronic obstructive pulmonary disease (COPD). A postbronchodilator FEV1/FVC ratio less than 0.7 or FEV1 less than 80% of the predicted value is diagnostic for COPD. (SOR B, based on diagnostic cohort studies.)
Evidence Based Practice 12(8): 06.