You will be asked to urinate (void). The following will be recorded:
- The time it takes you to begin urinating
- The size, force, and continuity of your urinary stream
- The amount of urine
- How long it took you to empty your bladder
- Any straining, hesitancy, or dribbling that occurred
You lie down, and a thin, flexible tube (catheter) is gently placed in your bladder. The catheter measures any urine left in the bladder. A smaller catheter is then placed in your rectum. Measuring electrodes are placed near the rectum.
Next, heat sensation is measured. Room-temperature salt-water (saline) solution is placed into the bladder. This is followed by warm water. You will tell the health care provider what, if any, sensations you feel. The water is then drained from the bladder.
A tube used to monitor bladder pressure (cystometer) is attached to the catheter. Water or carbon dioxide gas flows into the bladder at a controlled rate. You will be asked to tell the health care provider when you first feel the need to urinate.
You may be asked to cough or push so that the health care provider can check for urine leakage. When your bladder is full, you will be told to urinate. The pressure of your urine flow will be recorded.
Your bladder is again drained of any urine or water, and the catheter is removed.
In some cases, x-rays are taken during the test. This is called videourodynamics.