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Lung Function Tests
 

Obstructive Lung Disease

February 15th, 2021
 
 
 
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Overview

A reduced ;FEV₁:FVC ratio of <0.7 is diagnostic of obstructive lung disease.
  • Pulmonary Function Test Findings

  • FEV₁ reduced (<80% predicted)
  • FVC mildly reduced
  • FEV₁:FVC ratio reduced (<0.7)
  • 'Scooped' or 'dipped' flow-volume loop
  • Causes of Obstructive Disease

  • COPD
  • Asthma
  • Bronchiectasis
  • Cystic fibrosis
  • Bronchiolitis
  • α1-antitripsin deficiency
  • Severity of Obstructive Disease

    Based on FEV₁:
  • Mild - >70% predicted
  • Moderate - 60-69% predicted
  • Moderately severe - 50-59% predicted
  • Severe - 35-49% predicted
  • Very severe - <35% predicted
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