difference between asthma, copd, emphysema on PFT

• related: PFT and lung functions
• tags: #permanent #pulmonology

• normal spirometry, abnormal methacholine challenge, and then response to albuterol: asthma
• baseline obstruction, near normalization after bronchodilator: asthma
• baseline obstruction, no significant change after bronchodilator: COPD
• normal spirometry, CT showing emphysema: emphysema¹

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• PFT and lung functions
  • difference between asthma, copd, emphysema on PFT