Cystometrograms
Purpose
A cystometrogram (CMG) is a test that will measure the amount of fluid present in your bladder when you first feel the need to urinate, when when first sense the feeling of fullness and when you feel completely full. It will help your doctor to determine if you are having bladder spasms, which could cause many urinary/bladder symptoms and problems.
Description
To begin the procedure, you will be positioned on the examination table, as for a pelvic examination. You will be cleaned with an iodine solution, and then a catheter will be inserted into your urethra and placed in your bladder and your bladder will be emptied. A small balloon will be inflated inside the catheter to keep it in place during the test. The catheter has a measuring device called a manometer attached. Another catheter may be inserted in your rectum and a balloon inserted to keep it in place. There may be some mild discomfort upon insertion of the catheters. Your bladder will be filled slowly with warm water through the catheter. You will be asked to identify when you feel the water going into your bladder, when you feel the urge to urinate, and when you feel your bladder is as full as you can tolerate. You will also be asked to cough, sit, stand and bounce on your heels. You may be slightly uncomfortable from having a full bladder. The bladder will then be drained of urine or water and the catheter will be removed. The procedure may last from 45 minutes to an hour.
Preparation for a cystometrogram
The procedure can be performed anytime, except during your menstrual period and while you are being treated for urinary tract, kidney or bladder infection. Cystometrograms are performed on an outpatient basis. If you have any cardiac conditions, such as mitral valve prolapse or a heart murmur, you may require premedication at home prior to the test. Please notify your doctor or nurse of any cardiac conditions. No preparation is required before the procedure.
After the procedure
You may be given a prescription for antibiotics to prevent any infection.
Last Updated: September 23, 2009
