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Classification and grading of BOS in lung transplant recipients
| BOS 0 | FEV1 > 90% of baseline and FEF25–75 > 75% of baseline |
| BOS 0-p | FEV1 81–90% of baseline or FEF25–75≤ 75% of baseline |
| BOS 1 | FEV1 66–80% of baseline |
| BOS 2 | FEV1 51–65% of baseline |
| BOS 3 | FEV1 < 50% of baseline |
BOS, Bronchiolitis obliterans syndrome; BOS-p, potential bronchiolitis obliterans syndrome; FEV1, forced expiratory volume in 1 second; FEF25–75, forced expiratory flow from 25% to 75% of vital capacity.
