The specific procedure may vary slightly depending on the reason for the examination.
You will lie on a 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 liquid containing radioactive material flows into the bladder until the bladder is full or you say that your bladder feels full.
The scanner detects radioactivity to check your bladder and urinary tract. When the scan is done 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.