Diuretic Renal Scintigraphy

Rationale: Some patients with pelvicalyceal or ureteral dilatation may not have physiologically significant obstruction. Diuretic renal scintigraphy is based on the concept that activity in an unobstructed system will clear rapidly as a result of the high urine flow rate that occurs following administration of a diuretic. Conversely, a high flow rate will not be achieved in the presence of significant obstruction, and there will be absent or slow clearance of pelvicalyceal and/or ureteral activity.