How much improvement is needed in the FEV1 after bronchodilator therapy before reversibility can be considered present in the patient with obstructive lung disease?
a. 50 ml
b. 200 ml
c. 350 ml
d. 500 ml
ANS: B
By convention, improvement in the FEV1 by at least 12% and 200 ml following administration of a bronchodilator is considered evidence of reversibility.
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