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What is Uroflowmetry?

Uroflowmetry measures the flow of urine. It tracks how fast urine flows, how much flows out, and how long it takes. It’s a diagnostic test to assess how well the urinary tract functions. Your doctor may suggest uroflowmetry if you have trouble urinating, or have a slow stream.

By measuring the average and top rates of urine flow, this test can show an obstruction in your urinary tract such as an enlarged prostate. When combined with the cystometrogram (CMG) it can help find problems like a weak bladder.

What to Expect

Uroflowmetry equipment
Uroflowmetry equipment
National Institute of Diabetes and Digestive and Kidney Diseases,
National Institutes of Health

For this test, you should arrive at the doctor’s office with a fairly full bladder. If possible, do not urinate for a few hours before the test.

You will be asked to urinate into a funnel connected to the electronic uroflowmeter. This records information about your urine flow on a flow chart. The flow rate is calculated as milliliters (ml) of urine passed per second. Both average and top flow rates are measured.

The fastest flow rate, also known as Qmax, is used to understand if a block or obstruction is severe.

Your doctor will know your test results right away. Average results are based on your age and sex. Typically, urine flow runs from 10 ml to 21 ml per second. Women range closer to 15 ml to 18 ml per second.

  • A slow or low flow rate may mean there is an obstruction at the bladder neck or in the urethra, an enlarged prostate, or a weak bladder.
  • A fast or high flow rate may mean there are weak muscles around the urethra, or urinary incontinence problems.

You may be asked to take other tests to fully learn what’s going on for treatment. Your urologist will create a treatment plan based on test results and your health history.

More Information

  • What are results from this test telling you
  • What other tests will I need to explain my problem?
  • What are my next-steps?