Status asthmaticus other diagnostic studies

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

Overview

FEV1 lower than 60% predicted is strongly suggestive of severe airway obstruction. Peak flow rate measurement is a simple bedside method to assess the severity of airway obstruction. A red zone indicates less than 50% of the usual or normal peak flow reading signifying a severe airway obstruction.