Voiding Cystourethrogram

Test Overview

A voiding cystourethrogram (say "sis-toh-you-REE-throh-gram") is a test that is done to see if there are problems with the urinary system and to see how urine flows out of the bladder. This test, also called a VCUG, uses contrast fluid and X-rays so the doctor can see how the bladder fills and drains.

A VCUG can show if urine from the bladder is flowing back up toward the kidneys. This is called vesicoureteral reflux, or VUR.

For this test, a thin, flexible plastic tube called a catheter is placed through the urethra into the bladder. A contrast liquid flows through the catheter to fill the bladder. X-rays are taken while the bladder fills and then empties. The catheter slips out or is removed once the bladder is empty.