Urodynamic Pressure Flow Study 

A pressure flow study test looks for potential blockage in the urinary tract and measures bladder pressure created during urination.  

A pressure flow study, also known as a pressure voiding study, is a type of urodynamic test that measures the bladder pressure needed to urinate. In addition, how fast the urine flow is at the given pressure is also measured. This test is performed following a cystometric test.  

When is a Pressure Flow Test Performed? 

A pressure flow study is performed to help identify issues with the urinary system in both men and women, including bladder outlet obstruction (BOO). In men, an obstruction can be caused by an enlarged prostate gland.  

Procedure Details  

Because a pressure flow study is performed after a cystometric test, a small, soft void pressure catheter (manometer) will already have been inserted into your urethra (the opening through which urine leaves your body). Another small pressure-measuring catheter may already have been inserted into your rectum. In addition, you will have a full bladder, which is filled with sterile water or saline solution as part of the cystometric test.  

The pressure flow test begins when you are asked to empty your bladder in a special toilet with the catheters in place. The manometer will measure how well the bladder muscles work by detecting the pressure associated with the flow of urine.  

What to Expect 

After the procedure, you may feel some pain or a burning sensation. It’s possible you’ll also see a small amount of blood in the urine. These side effects will likely resolve within a day or two. If you continue to see blood in your urine or have a fever, you should alert your doctor right away.  


Pressure flow studies are effective tools for helping urologists determine the causes of a number of urological issues, including BOO, enlarged prostate, urinary incontinence and others. 

At Tampa General Hospital, the expert urologists complete through urodynamic tests such as pressure flow studies to help diagnose patients and formulate individualized treatment plans. Our multidisciplinary approach to treatment allows us to provide world-class care to patients and ensure the best overall results.