The non-ionic and low-osmotic pressure contrast media Iopamilon 370 was used on 20 outpatients who had not been found to have abnormal renal function. The results were compared with those obtained with Urographin (76%), currently used at our department, on 13 of the 20 patients. The nephrograms and renal pelvis obtained using Iopamilon 370 tended to have a clearer contrast than those obtained with Urographin. No side effects were produced