Question No 21:
Which of the following thresholds for a clinically significant change in lung function from the beginning to
the end of a methacholine challenge test is significant?
A. An increase of more than 20% in airway resistance
B. Adecline of more than 30% in FEF25-75%
C. Adecline of more than 20% in FEV1
D. Adecline of more than 20% in inspiratory capacity
Answer: C
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