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endoscopical GERD in CRF patients by endoscopic examination. PATIENTS AND METHODS This study involved consisted of 156 CRF patients (97 men [62%] and 59 women [38%], mean age: 64.2 [range: 29-89] years) whose creatinine level was more than 2 mg/dl and who underwent endoscopy examina-tion at our hospital between January 2001 and March 2004. This group involved 42 patients (27%) with some upper GI symptoms, 55 patients (35%) with DM and 87 patients (56%) with HT (Table 1). To investigate renal function, we classified the patients into three categories based on the creatinine level and as follows: 2 < Cr. < 5 (44 patients [28%]), Cr. 5 < and patients on pre-dialysis (53 patients [34%]), Cr. 5 < and patients on hemodialysis (59 patients [38%]) (Table 1). As we could not examine glomerular filtration rate (GFR) of all patients, we used serum creatinine level as renal func-tion. These clinical findings were compared with the gastroendoscopic findings retrospectively. For statistical analysis, the χ2 test was used and P-values of < 0.05 were considered statistically signifi-cant. RESULTS The prevalence of GERD was highest (53 patients [34.0%]) in the gastroendoscopic findings of the 15