When evaluating a forced vital capacity maneuver postbronchodilator use to determine the re-versibility of any airway obstruction, what percent increase in FEV1 is needed to be able to say the treatment was effective?
a. 5%
b. 10%
c. 15%
d. 20%
ANS: C
Although improvements in other measurements of pulmonary function are sometimes used, re-versibility is defined as a 15% or greater improvement in FEV1.
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