An increase in the FEV1/FVC ratio after administration of a short-acting bronchodilator indicates reversible airway obstruction and helps distinguish asthma from COPD in symptomatic patients.
False
True
Post-bronchodilator spirometry is used to differentiate obstructive lung diseases. If the FEV1/FVC ratio rises to ≥0.70 (or returns to the lower limit of normal) after bronchodilator, the airflow limitation is considered reversible-typical of asthma. In COPD, airflow limitation is largely irreversible and the post-bronchodilator FEV1/FVC ratio remains persistently <0.70. Thus, an increased ratio after bronchodilator supports asthma rather than COPD.
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