Airway obstruction other diagnostic studies

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Obstruction can be measured using spirometry. A decreased FEV1/VC ratio (versus the normal of about 80%) is indicative of an airway obstruction, as the normal amount of air can no longer be exhaled in the first second of expiration. An airway restriction would not produce a reduced FEV1/VC ratio, would produce a reduced vital capacity.

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