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Table 2 BOS classification system

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

 FEV1FEV25-75
BOS 0> 90% of baseline> 75% of baseline
BOS 0-p81–90% of baseline< or = 75% of baseline
BOS 166–80% of baseline 
BOS 251–60% 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%)