Pulmonary Function Testing – PFTs or Spirometry

PFTs Pulmonary function tests or Spirometry
  • Normals
    • FEV1/FVC nl >70%
    • FVC  nl > 80%
    • FEV1 25-75% nl >70%
    • TLC >80%
  • Restrictive – TLC < 80%, ↓FVC
    • Cause: Fibrotic lung disease, Neuromuscular weakness, Chest wall disease, Poor effort, Intra-alveolar fluid 
  • Obstructive – ↓↓FEV1
    • FEV1/FVC <70% — Be really strict based on age
      • 5-19yo >85%
      • 20-39yo >80%
      • 40-59yo >75%
      • 60-80yo >70%
    • Cause: Emphysema, Asthma, COPD, Cystic fibrosis, Upper airway obstruction, Cancer
  • Reversibilitychange in FEV1 of >12%→give med and better=asthma
 pulm-spirometry – Spirometry Interpretation Sheet from HealthTeamWorks PDF
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