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Lung Function Tests


March 4th, 2023


The forced expiratory volume in 1 sec (FEV₁) is the amount of air forcefully exhaled in the first second following a maximal inhalation.
    • Normal Range

    • 80 - 120% predicted
Low FEV₁ (<80% predicted) indicates obstructive or restrictive disease, though may also be due to poor expiratory effort.
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