The purpose of urodynamics is to find out how the bladder acts when it fills and empties.

Urodynamics is done by inserting a catheter into the bladder through the urethra and a catheter into the rectum. During the test, your bladder will be filled with sterile water through the bladder catheter.

This test is performed by a Registered Nurse or technician as per Doctor’s orders. The procedure takes approximately 30-40 minutes. Drink 2 cups of water, 30 minutes prior to your test, so that you arrive at North Island Urology with a comfortable urge to urinate. Less water if you have urge urinary incontinence.

Please allow yourself enough time to get to north island urology. Your test will be cancelled if you are late and there is not enough time to do your test. You will be asked to book it for another day.


  • If you need help with walking, dressing, undressing or transferring, you MUST bring someone who can help you.
  • Inform NIU if you have an indwelling catheter
  • On arrival check with front staff
  • On arrival if you need to urinate please inform staff
  • Bring your current medication
  • Stop your anticholinergic medication 5 days  before the test unless you have a spinal cord injury or directed by your physician to continue

What Happens during Urodynamics testing

  • You change into a gown
  • The nurse will ask you about your urinary symptoms

There are three phases to the test:

Phase 1

You are asked to pass your urine (empty your bladder) into a container. This container is joined to a computer that records the speed and amount of urine you pass.

Phase 2

You are asked to move from the toilet to the bed where a catheter is inserted into your bladder and another catheter in your rectum.

Your bladder will be slowly filled with sterile water and the nurse will ask you a series of questions while your bladder is being filled.

This part of the test shows what happens in the bladder as it fills.

Phase 3

You are asked to move from the stretcher/bed to the commode where you need to pass your urine (empty your bladder).

The catheter and rectal tube are removed when your test is finished.

After the Test

Drink plenty of water, 1 glass every 2 hours, and to ensure to urinate frequently for the rest of the day (until you go to bed).

Avoid drinks with caffeine or alcohol for 24 hours after your test.

You may experience a slight burning and small amount of blood in your urine when you urinate. This should go away within 24 to 48 hours after the test.

Notify your Family Doctor or Urologist or go to the Emergency Department if any of the following happens:

  • Urine becomes increasingly bloody
  • You pass many blood clots
  • You develop chills and/or fever with a temperature higher than 38 degrees Celsius
  • You are having pain, burning or feeling of having to urinate often for more than 48 hours
  • Prescribed medication does not relieve pain