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.