Urodynamic Testing

Urodynamics is a set of tests that measure how the bladder and urethra store and release urine. Thin pressure-sensing catheters record what happens as your bladder is filled with fluid and then emptied, and a computer plots pressure against flow.

It explains symptoms that history and examination cannot separate, for instance whether leakage comes from a weak sphincter or an overactive bladder muscle, or whether a poor stream is due to obstruction or a weak bladder. It is invasive and somewhat undignified, it does not always reproduce your everyday symptoms, and it is unnecessary for straightforward cases.

What Urodynamic Testing shows

The filling phase (cystometry) measures bladder sensation, capacity, compliance (how stiff the bladder wall is) and involuntary contractions of the detrusor muscle. A cough or strain test measures the pressure at which urine leaks, which defines stress incontinence. The voiding phase (pressure-flow study) records bladder pressure against flow rate: high pressure with low flow means obstruction, for example from the prostate or a stricture, while low pressure with low flow indicates an underactive bladder. Residual urine is measured at the end. Video-urodynamics adds X-ray contrast to show the shape of the bladder, reflux up to the kidneys and the exact site of a blockage. Sphincter muscle activity can be recorded with surface electrodes.

When Urodynamic Testing is recommended

• Before surgery for stress incontinence when symptoms are mixed, the diagnosis is unclear or an earlier operation has failed
• Men with urinary symptoms where it is uncertain whether the prostate is obstructing, especially younger or older men, or after previous prostate surgery
• Neurological conditions affecting the bladder, such as spinal cord injury, multiple sclerosis or spina bifida, to protect the kidneys
• Overactive bladder that has not responded to medication, before botulinum toxin or nerve stimulation
• Unexplained urinary retention or incomplete emptying
• Children with complex bladder dysfunction or reflux

Limits and situations where another test is better:

• Uncomplicated stress incontinence in women with a clear history, where trials show testing does not change outcomes
• First-line assessment of urinary symptoms, where a bladder diary, flow test and residual scan come first
• During an active urinary infection, which both distorts the results and makes the test risky
• It shows function, not structure: blood in the urine needs cystoscopy and imaging instead

How to prepare

• Complete a 3-day bladder diary of drinks, volumes passed and leaks, and bring it with you
• Arrive with a comfortably full bladder for the initial flow test
• A urine dipstick is done on arrival; the test is postponed if infection is found
• Ask whether to stop bladder medicines such as antimuscarinics or mirabegron about a week beforehand
• Empty your bowels that day if possible, since a full rectum affects readings
• Tell staff about latex allergy, artificial heart valves or joint replacements, or a possible pregnancy

What happens during the test

First you pass urine in private into a flow meter. Then, with anaesthetic gel, a thin double-lumen catheter is passed into the bladder and another small catheter into the rectum, or the vagina, to measure abdominal pressure. Your bladder is filled slowly with sterile saline while you report the first sensation, a normal desire and a strong urge to void. You are asked to cough and strain, sometimes standing up. Finally you pass urine around the fine catheter into the flow meter. The catheters are then removed. It takes 30 to 45 minutes. It is awkward rather than painful, and staff are used to putting people at ease.

Results and next steps

The clinician can often explain the main findings straight away from the traces, and a formal report follows within a few days. The results decide treatment: pelvic floor physiotherapy, medication, a sling or bulking injection, botulinum toxin, prostate surgery, or intermittent self-catheterisation. Occasionally the test does not reproduce your symptoms and is inconclusive.

• Test time: 30 to 45 minutes
• Results ready: Same day discussion; report in a few days
• Back to everyday activity: None

Safety and risks

• Stinging when passing urine, and slight blood staining, for 24 to 48 hours
• Urinary infection in about 2 to 5 percent; drink extra fluid that day
• Brief inability to pass urine, rarely, mostly in men with obstruction
• Autonomic dysreflexia in people with spinal cord injury above T6, for which staff monitor blood pressure
• A small radiation dose if video is used

Arranging Urodynamic Testing in Türkiye

Not worth a trip alone, but useful when you come for incontinence, prolapse or prostate surgery and the surgeon needs objective confirmation before operating. It can be done the day before a decision is made. If you have had the test within the last year or so, bring the traces and report to avoid a repeat.

Send your previous reports and the question you want answered and a Clinic-Y coordinator replies within 24 hours with suitable teams and written, all-inclusive proposals side by side. Reviewing your case is free.

Frequently Asked Questions