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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%)