DefinitionA voiding cystourethrogram is an x-ray examination of the bladder and urethra that is performed while the bladder is emptying.Alternative NamesCystourethrogram - voidingHow the test is performedThe test is performed in a hospital radiology department or in a health care provider's office by an x-ray technician.You will lie on your back on the x-ray table. A thin, flexible tube called a catheter will be gently inserted into the urethra (the tube that carries urine from the bladder to the outside of the body) and passed into the bladder.Contrast dye flows through the catheter into the bladder. This dye helps the bladder show up better on x-ray images.The x-rays are taken from various angles while the bladder is full of contrast dye. The catheter is removed so that you can urinate.