Test Findings

Reduced FEV₁



  • 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.
Want more info like this?
  • Your electronic clinical medicine handbook
  • Guides to help pass your exams
  • Tools every medical student needs
  • Quick diagrams to have the answers, fast
  • Quizzes to test your knowledge