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Lung Function Tests
 
 

Obstructive Lung Disease

 
 
 
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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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