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Cystometric study

Cystometric study measures the amount of fluid in the bladder when you first feel the need to urinate, when you are able to sense fullness, and when your bladder is completely full.

  • Alternative Names

    CMG; Cystometrogram

  • How the test is performed

    You will be asked to void (urinate). The following will be recorded:

    • The time it takes you to begin voiding
    • The size, force, and continuity of your urinary stream
    • The amount of urine
    • How long it took you to empty your bladder
    • Any straining, hesitancy, or dribbling that occurred

    You lie down, and a thin, flexible tube (catheter) is gently placed in your bladder. The catheter measures and records any urine left in the bladder. A catheter is then placed in your rectum, and measuring electrodes are placed near the rectum (perineum).

    Next, thermal sensation is measured. Room-temperature salt-water (saline) solution is placed into the bladder. This is followed by warm water. You will tell the health care provider what, if any, sensations you feel. The water is then drained from the bladder.

    A tube used to monitor bladder pressure (cystometer) is then connected to the catheter. Water or carbon dioxide gas is introduced into the bladder at a controlled rate. You will be asked to tell the provider when you first feel the need to urinate. When the bladder is full, you must urinate. The pressure of this urination is recorded.

    The bladder is again drained of any urine or water, and the catheter is removed.

  • How to prepare for the test

    No special preparations are necessary for this test.

    For infants and children, preparation depends on the child's age, previous experiences, and level of trust. For general information regarding how you can prepare your child, see the following topics:

  • How the test will feel

    There is some discomfort associated with this test. You may experience:

    • Bladder filling
    • Flushing
    • Nausea
    • Pain
    • Sweating
    • Urgent need to urinate
  • Why the test is performed

    The test will help determine the cause of bladder voiding dysfunction.

  • Normal Values

    Normal values vary and should be discussed with your health care provider.

  • What abnormal results mean

    The test might indicate a cause for:

  • What the risks are

    There is a slight risk of urinary tract infection and blood in the urine.

  • Special considerations

    This test should not be done if you have a known urinary tract infection. Existing infection increases the possibility of false test results. The test itself increases the possibility of spreading the infection.

  • References

    Peterson AC, Webster GD. Urodynamic and videourodynamic evaluation of voiding dysfunction. In: Wein AJ, ed. Campbell-Walsh Urology. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 58.

Review Date: 5/22/2008

Reviewed By: Scott M. Gilbert, MD, Department of Urology, Columbia-Presbyterian Medical Center, New York, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- 2014 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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