This is a multi-center, randomized controlled trial of ultrasonography (ultrasound) compared
to computed tomography (CT) for the initial emergency room evaluation of patients with
suspected renal colic. The investigators will compare several measures of effectiveness
including morbidity related to the patient's underlying disease, or complications related to
delayed diagnosis, patient status regarding pain/missed days of work, and utilization of
health care resources based on one of three study arms: ultrasound in the Emergency
Department, ultrasound in Radiology or CT.