Randomized prospective trial comparing immediate versus delayed ureteroscopy for patients with ureteral calculi and normal renal function who present to the emergency department.

Purpose: To compare the safety and efficacy of emergency vs scheduled ureteroscopy with a prospective study that included patients who presented to the emergency department (ED) with renal colic from ureteral stones.

Patients And Methods: There were 271 consecutive patients who were enrolled in this prospective study. Patients were randomized to emergency ureteroscopy (group A) or delayed ureteroscopy (group B).