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Alternative names



Uroflometry is a test to measure the volume of urine voided (urinated), the velocity or speed of the urination, and its duration.

How the test is performed

You are asked to urinate in a special urinal or toilet that is equipped with a machine that includes a measuring device.

You are asked to press a button shortly before you try to begin urination, and you may be required to press the button again when urination is complete. This machine will create a report for your health care provider to evaluate.

How to prepare for the test

Your health care provider may ask you to temporarily discontinue medications that can alter test results.

Uroflometry is best preformed with a full bladder. Do not urinate for 2 hours prior to the test. 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:
  • preschooler test or procedure preparation (3 to 6 years)
  • schoolage test or procedure preparation (6 to 12 years)
  • adolescent test or procedure preparation (12 to 18 years)

How the test will feel

The test involves normal urination, so you should not experience any discomfort.

Why the test is performed

This test is useful in evaluating the function of the urinary tract.

Normal Values

Normal values vary depending on age and sex:
  • Age: 4 to 7
    • The average flow rate for both males and females is 10 mL/sec.
  • Age: 8 to 13
    • The average flow rate for males is 12 mL/sec.
    • The average flow rate for females is 15 mL/sec.
  • Age: 14 to 45
    • The average flow rate for males is 21 mL/sec.
    • The average flow rate for females is 18 mL/sec.
  • Age: 46 to 65
    • The average flow rate for males is 12 mL/sec.
    • The average flow rate for females is 15 mL/sec.
  • Age: 66 to 80
    • The average flow rate for males is 9 mL/sec.
    • The average flow rate for females is 10 mL/sec.

What abnormal results mean

Several circular muscles normally regulate urine flow, and if any becomes weak or dysfunctional, an increase in urine flow and/or urinary incontinence may result.

If there is a bladder outlet obstruction or if the bladder muscle is weak, a decrease in urine flow may result.

Any abnormal results should be discussed with you and explained by your health care provider.

What the risks are

There are no risks associated with this test.

Update Date: 10/28/2002

David R. Knowles M.D., Department of Urology, New York-Presbyterian Hospital Columbia Campus, New York, NY. Review provided by VeriMed Healthcare Network.

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Last updated: Tue, 06 Jan 2009 00:20:03 GMT