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You are here : AllRefer.com > Health > Tests & Exams > Cystometric study

Cystometric study

Alternate Names : CMG, Cystometrogram


Definition

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.

Why is the Test Performed?

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

How is the Test 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 will the Test Feel?

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

  • Bladder filling
  • Flushing
  • Nausea
  • Pain
  • Sweating
  • Urgent need to urinate




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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.



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