Intestinal permeability measured by urine L:R ratio. (A) Longitudinal intestinal permeability of 80 allogeneic BMT recipients. (B) Baseline L:R ratio by diagnosis group. Trajectory of L:R ratio in patients who received a (C) myeloablative conditioning and (D) reduced intensity conditioning regimen. There were no significant differences between the L:R ratios of (C) and (D) at any of the timepoints. BMF, bone marrow failure; BMT, bone marrow transplant; Malig, malignancy; PID, primary immune deficiency.