As part of the pre-operative assessment for prostatectomy, the routine intravenous urogram continues to be requested by many practitioners. One hundred and ten patients being considered for prostatectomy underwent, prospectively, intravenous urography and trans-abdominal ultrasound. This paper specifically examines the respective contribution to management of these investigations. In 34% of patients, management was influenced in some way. This could have been achieved by ultrasound and plain abdominal radiograph alone. Additional intravenous urography would not have affected the clinical management of any patient.