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©2013 UpToDate ® Print Email Original and proposed classifications of BOS Original classification Current proposition BOS 0 FEV 1 80 percent or more of baseline BOS 0 FEV 1 > 90 percent of baseline and FEF 25-75 > 75 percent of baseline BOS 0-p FEV 1 81 to 90 percent of baseline and/or FEF 25-75 ≤ 75 percent of baseline BOS 1 FEV 1 66 to 80 percent of baseline BOS 1 FEV 1 66 to 80 percent of baseline BOS 2 FEV 1 51 to 65 percent of baseline BOS 2 FEV 1 51 to 65 percent of baseline BOS 3 FEV 1 50 percent or less of baseline BOS 3 FEV 1 50 percent or less of baseline BOS: bronchiolitis obliterans syndrome; FEF 25-75 : mid-expiratory flow rate; FEV 1 : forced expiratory volume in 1 second. Reproduced with permission from: Estenne, M, Maurer, JR, Boehler, A, et al. Bronchiolitis obliterans syndrome 2001: an update of the diagnostic criteria. J Heart Lung Transplant 2002; 21:297. Copyright © 2006 The International Society for Heart and Lung Transplantation.