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Urine sample
Urine sample


Definition:

Uroflowmetry is a test that measures the volume of urine released (excreted) from the body, the speed with which it is excreted, and how long the excretion takes.



Alternative Names:

Uroflow



How the test is performed:

You will urinate in a special urinal or toilet with a machine that has a measuring device.

You will be asked to begin urinating after the machine has started. When you finish, the machine will create a report for your health care provider.



How to prepare for the test:

Your health care provider may ask you to temporarily stop taking medications that can affect the test results.

Uroflowmetry is best done when you have a full bladder. Do not urinate for 2 hours before the test. Drink extra fluids so you will have plenty of urine for the test.

Do not place any toilet tissue in the test machine.



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:

  • Ages 4 - 7
    • The average flow rate for both males and females is 10 mL/sec.
  • Ages 8 - 13
    • The average flow rate for males is 12 mL/sec.
    • The average flow rate for females is 15 mL/sec.
  • Ages 14 - 45
    • The average flow rate for males is 21 mL/sec.
    • The average flow rate for females is 18 mL/sec.
  • Ages 46 - 65
    • The average flow rate for males is 12 mL/sec.
    • The average flow rate for females is 15 mL/sec.
  • Ages 66 - 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:

Results are compared with your symptoms and physical exam. A result that may need treatment in one patient may not need treatment in another patient.

Several circular muscles normally regulate urine flow. If any of these muscles becomes weak or stops working, you may have an increase in urine flow or urinary incontinence .

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

Your health care provider should explain and discuss any abnormal results with you.



What the risks are:

There are no risks with this test.



Special considerations:




Review Date: 9/7/2008
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Louis S. Liou, MD, PhD, Assistant Professor of Urology, Department of Surgery, Boston University School of Medicine. 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- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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