A radionuclide cystogram is a special imaging tests called a nuclear scan that involves placing radioactive material into the bladder. A scanner then detects radioactivity to check bladder and urinary tract functions.

This test is done to see how your bladder empties and fills. It can be used to check for urine reflux or an obstruction in urine flow. It is usually done to evaluate patients with urinary tract infections, particularly children.

The specific procedure may vary slightly depending on the reason for the examination.

You will lie on the scanner table. After cleaning the urinary opening, the health care provider will place a thin flexible tube, called a catheter, through the urethra and into the bladder. A solution containing the radioisotope flows into the bladder until the bladder is full (or you say that your bladder feels full).

The timing of the scan depends on the suspected problem. You may be asked to urinate into a urinal, bedpan, or towels while being scanned.

To test for incomplete bladder emptying, images may be taken with the bladder full, then you will be allowed to get up and urinate into the toilet and return to the scanner. Images are taken immediately after emptying the bladder.

There is no special preparation needed. You will need to sign a consent form. You will be asked to wear a hospital gown. Remove jewelry and metal objects before the scan.

You may feel some discomfort when the catheter is inserted. Catheterization and urination in public -- sometimes, when lying on the table -- may be difficult or embarrassing. You cannot feel the radioisotope or the scanning.

After the scan, you may feel slight discomfort for 1 or 2 days when you urinate. The urine may be slightly pink. If you have persistent discomfort, a fever, or bright red urine, contact your health care provider.