Medicine Reversible airway obstruction is defined as ___ percentage increase in FEV1, 15 minutes after an inhaled sho-acting beta 2 -agonist therapy- A >_ 5% B >_10 C >_ 15% D >_ 20 💡 Explanation Reversible airway obstruction is defined as ___ percentage increase in FEV1, 15 minutes after an inhaled sho-acting beta 2 -agonist therapy- ✓ Correct Answer: C. >_ 15%