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Table 2 BOS classification system

From: Imaging indications and findings in evaluation of lung transplant graft dysfunction and rejection

  FEV1 FEV25-75
BOS 0 > 90% of baseline > 75% of baseline
BOS 0-p 81–90% of baseline < or = 75% of baseline
BOS 1 66–80% of baseline  
BOS 2 51–60% of baseline  
BOS 3 < 50% of baseline  
  1. BOS, bronchiolitis obliterans syndrome; BOS 0-p, potential BOS; FEV1, forced expiratory volume in 1 s; FEV25-75, forced expiratory flow at mid-expiratory phase (25–75%)