This test is performed in a hospital or in a health care provider’s office. An x-ray technician supervised by a doctor does the job. You will need no special preparation.
First you will be asked to lie down on your back and to stay still. A basic x-ray of the abdomen and pelvis is taken. This helps the doctor decide on the best way to position the test.
Then a thin, flexible tube called a catheter is put through the urethra into the bladder. Dye is placed in the bladder through this tube. You may experience some discomfort when the catheter is inserted. As the bladder fills, x-rays are taken in different positions and times.
The catheter is taken out and more x-rays are taken while you pass urine into a container. Once your bladder is empty, a final x-ray is taken. The entire test takes about an hour.