Test Findings
 
 

Reduced FEV₁

 
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Overview

  • 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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