Robert Wood Johnson University Hospital
 

Uroflowmetry

Uroflowmetry

(Urine Flow Studies, Urine Flow Test, Urodynamic Studies)

Procedure Overview

What is uroflowmetry?

Uroflowmetry is a simple, diagnostic screening procedure used to calculate the flow rate of urine over time. The test is noninvasive (the skin is not pierced), and may be used to assess bladder and sphincter function.

Uroflowmetry is performed by having a person urinate into a special funnel that is connected to a measuring instrument. The measuring instrument calculates the amount of urine, rate of flow in seconds, and length of time until completion of the void. This information is converted into a graph and interpreted by a doctor. The information helps evaluate function of the lower urinary tract or help determine if there is an obstruction of normal urine outflow.

During normal urination, the initial urine stream starts slowly but almost immediately speeds up until the bladder is nearly empty. The urine flow then slows again until the bladder is empty. In persons with a urinary tract obstruction, this pattern of flow is altered, and increases and decreases more gradually. The uroflowmeter graphs this information, taking into account the person’s gender and age. Depending on the results of the procedure, other tests may be recommended by your doctor.

Other related procedures that may be used to diagnose urinary outflow obstruction or lower urinary tract dysfunction include cystometry, cystography, retrograde cystography, and cystoscopy. Please see these procedures for additional information.

How does the urinary system work?

Illustration of the anatomy of the urinary system, front view
Click Image to Enlarge

The body takes nutrients from food and converts them to energy. After the body has taken the food that it needs, waste products are left behind in the bowel and in the blood.

The urinary system keeps the chemicals, such as potassium and sodium, and water in balance, and removes a type of waste, called urea, from the blood. Urea is produced when foods containing protein, such as meat, poultry, and certain vegetables, are broken down in the body. Urea is carried in the bloodstream to the kidneys.

Urinary system parts and their functions:

Facts about urine

Reasons for the Procedure

Uroflowmetry is a quick, simple diagnostic screening test that provides valuable feedback about the health of the lower urinary tract. It is commonly performed to determine if there is obstruction to normal urine outflow. Medical conditions that can alter the normal flow of urine include, but are not limited to, the following:

Uroflowmetry may be performed in conjunction with other diagnostic procedures, such as cystometry and cystography.

There may be other reasons for your doctor to recommend uroflowmetry.

Risks of the Procedure

Because uroflowmetry is a noninvasive procedure, it is safe for most persons. The test is usually done in privacy to ensure that the person voids in a natural setting.

There may be risks depending upon your specific medical condition. Be sure to discuss any concerns with your doctor prior to the procedure.

Certain factors or conditions may interfere with the accuracy of uroflowmetry. These factors include, but are not limited to, the following:

Before the Procedure

During the Procedure

Uroflowmetry may be performed on an outpatient basis or as part of your stay in the hospital. Procedures may vary depending on your condition and your doctor’s practices.

Generally, uroflowmetry follows this process:

  1. You will be taken into the procedure area and instructed how to use the uroflowmetry device.
  2. When you are ready to urinate, you will press the flowmeter start button and count for five seconds before beginning urination.
  3. You will begin to urinate into the funnel device that is attached to the regular commode. The flowmeter will record information as you are urinating.
  4. You should not push or strain as you urinate. You should remain as still as possible.
  5. When you have finished urinating, you will count for five seconds and press the flowmeter button again.
  6. You should not put any toilet paper into the funnel device.
  7. The procedure will be concluded at this point. Depending on your specific medical condition, you may be asked to perform the test on several consecutive days.

After the Procedure

Generally, there is no special type of care following uroflowmetry. However, your doctor may give you additional or alternate instructions after the procedure, depending on your particular situation.

Online Resources

The content provided here is for informational purposes only, and was not designed to diagnose or treat a health problem or disease, or replace the professional medical advice you receive from your doctor. Please consult your doctor with any questions or concerns you may have regarding your condition.

This page contains links to other websites with information about this procedure and related health conditions. We hope you find these sites helpful, but please remember we do not control or endorse the information presented on these websites, nor do these sites endorse the information contained here.

American Cancer Society

American Urological Association

National Institute of Diabetes and Digestive and Kidney Diseases

National Institutes of Health (NIH)

National Kidney Foundation

National Library of Medicine

 

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