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Urine sample
Urine sample

Uroflometry
Definition:
A test to measure the volume of urine voided (urinated), the velocity or speed of the urination, and the duration of urination.
How the test is performed:

You are asked to sit on a portable toilet called a commode chair. You push a button on the chair 5 seconds before you urinate, then 5 seconds after you are finished. A graph of your urine output is produced that plots the volume of urine versus time.
How to prepare for the test:
Your health care provider may ask you to temporarily discontinue medications that can alter test results.

Do not urinate for 2 hours before the test, and increase the volume of fluids you drink so you will have plenty of urine for the test.

Do not place any toilet tissue in the urine receptacle.

Infants and children:
The physical and psychological preparation you can provide for this or any test or procedure depends on your child's age, interests, previous experience, and level of trust. For specific information regarding how you can prepare your child, see the following topics as they correspond to your child's age:

How the test will feel:
The test involves only normal urination.
Why the test is performed:
This test is useful in evaluating urinary tract function and in the detecting of bladder outlet obstruction.
Normal Values:
Normal values vary depending on age and sex:
  • Age: 4 to 7
    • The average flow rate for males and females is 10 ml/sec.
  • Age: 8 to 13
    • The average flow rate for males is 12 ml/sec and 15 ml/sec for females.
  • Age: 14 to 45
    • The average flow rate for males is 21 ml/sec and 18 ml/sec for females.
  • Age: 46 to 65
    • The average flow rate for males is 12 ml/sec and 15 ml/sec for females.
  • Age: 66 to 80
    • The average flow rate for males is 9 ml/sec and 10 ml/sec for females.
What abnormal results mean:
Several circular muscles normally regulate urine flow, and if any becomes weak or dysfunctional, an increase in urine flow and urinary incontinence may result.

If there is a bladder outlet obstruction or the bladder muscle is weak, a decrease in urine flow may result.
What the risks are:
There are no risks associated with this test.
Review Date: 6/1/2001
Reviewed By: Debra Fromer, M.D. Department of Urology, New York-Presbyterian Hospital, New York, NY. Review provided by VeriMed Healthcare Network.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician 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. Copyright 2002 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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