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BRONCHIOLITIS OBLITERANS SYNDROME 2002 CLASSIFICATION SYSTEM
| BOS Stage | Pulmonary Function |
|---|---|
| 0 | FEV1 > 90% of baseline and |
| FEF25–75 > 75% of baseline | |
| 0p | FEV1 81–90% of baseline and/or |
| FEF25–75 ⩽ 75% of baseline | |
| 1 | FEV1 66–80% of baseline |
| 2 | FEV1 51–65% of baseline |
| 3 | FEV1 ⩽ 50% of baseline |
Definition of abbreviation: BOS = bronchiolitis obliterans syndrome.
