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Bronchiolitis obliterans syndrome (BOS) classification
| BOS Stage | Classification |
|---|---|
| 0 | FEV1 > 90% of baseline & FEF25-75% > 75% of baseline |
| 0-p* | FEV1 81-90% of baseline &/or FEF25-75% ≤ 75% of baseline |
| 1 | FEV1 66-80% of baseline |
| 2 | FEV1 51-65% of baseline |
| 3 | FEV1 ≤ 50% of baseline |
*0-p = potential BOS, Modified from Reference #6
