Objective:There is no correlation between the preoperative bladder urine culture (PBUC) sensitivity test and the results of the renal pelvic urine culture (RPUC) test.Materials and Methods:A total of 129 patients who underwent f-URS included the study. Preoperatively, PBUC was collected in all cases, and RPUC was taken when starting the surgery.Results:In PBUC, there was growth in 25 (19.4%) patients and in RPUC, there were only in 35 (27.1%) cases. Preoperative tomographic urine density at the renal pelvis [odds ratio (OR): 0.848, p