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Urodynamic Tests
Urodynamic tests measure how well the bladder stores and empties urine, used to investigate incontinence and other bladder problems.
Quick answer
Urodynamic Tests: what it is and what the results mean
Urodynamics is a group of tests that assess bladder and urethral function — how the bladder fills, stores and empties urine, and the pressures involved. Small tubes (catheters) measure pressure as the bladder is filled and emptied.
- Why it is done: It is used to investigate urinary incontinence, difficulty passing urine, an overactive bladder, and to plan treatment or surgery when simpler assessments have not given a clear answer.
- Understanding results: The pressures and flow patterns show how the bladder behaves during filling and emptying, helping identify the cause of symptoms and guide treatment such as medicines, bladder training or surgery.
What it is
Urodynamics is a group of tests that assess bladder and urethral function — how the bladder fills, stores and empties urine, and the pressures involved. Small tubes (catheters) measure pressure as the bladder is filled and emptied.
Why it is done
It is used to investigate urinary incontinence, difficulty passing urine, an overactive bladder, and to plan treatment or surgery when simpler assessments have not given a clear answer.
What to expect
Fine catheters are placed into the bladder and sometimes the back passage to measure pressure. The bladder is filled with fluid while readings are taken, and you are asked to cough or pass urine. It takes about 30–45 minutes and can feel uncomfortable and undignified but is not usually painful.
Understanding the results
The pressures and flow patterns show how the bladder behaves during filling and emptying, helping identify the cause of symptoms and guide treatment such as medicines, bladder training or surgery.
Good to know
Risks and limitations
It is generally safe but can cause temporary discomfort, and there is a small risk of a urinary infection afterwards. It is usually reserved for when the diagnosis is unclear or before surgery.
Education and reference only. This explains the test in general terms and is not medical advice. Always follow the specific instructions from the team arranging your test, and discuss your results with your clinician.
Answers
Urodynamic Tests: frequently asked questions
Are urodynamic tests painful?
They are more uncomfortable and undignified than painful, involving fine tubes and bladder filling. Staff are used to putting people at ease, and the tests give important information about bladder function.
Could I get an infection afterwards?
There is a small risk of a urinary infection after the test. If you develop burning, fever or worsening symptoms in the following days, contact your healthcare team, as antibiotics may be needed.
Related tests
Other other investigations
Sources
Where this is drawn from
- NHS — Tests and treatments
- NICE — diagnostic guidance
- Relevant royal college / professional body
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