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Pulmonary Function Criteria for BOS staging. (36)
| BOS Stage | FEV1 (% pred) |
|---|---|
| 0p | FEV1 81–90% of best and/or FEF 25–75% is < 75% of best |
| BOS1 | FEV1 66–80% of best |
| BOS2 | FEV1 51–65% of best |
| BOS3 | FEV1 < 50% of best |
BOS – bronchiolitis obliterans syndrome
FEV1 – forced expiratory volume in 1 second, as a percent of the predicted value for age
FEF 25–75% - mid-expiratory flow rate
