Medicine All of the following explains diagnosis of Asthma except A After administering bronchodilator FEV1 increase to > 200mL within 15 minutes B PEFR shows diurnal variation of >20% C >12% reversibility in FEV1 on administering bronchodilator D Diffusion Lung Capacity for carbon monoxide is decreased 💡 Explanation All of the following explains diagnosis of Asthma except ✓ Correct Answer: D. Diffusion Lung Capacity for carbon monoxide is decreased