which is not affected by hydrational status and lower body pool than albumin. This study showed six patients (50%) in the hypoprealbumin group, but they had normal serum albumin levels. The normal range of prealbumin level was 15-46 mg/dL, but varied due to different centers. Bae et al. used prealbumin less than 18 mg/dL as a marker for predicting complications, especially infectious complications after surgery, in patients who underwent gastric surgery due to benign or malignant gastric disease. In our study, we chose to study postoperative bowel recovery function in only patients who underwent radical cystectomy with urinary diversion using intestinal segments.