Urodynamic studies (bladder tests)
A group of bladder tests that measure how the bladder fills, stores and empties urine, used to clarify the cause of bladder problems before some treatments.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Urodynamic studies measure how the bladder fills, stores and empties, to clarify the cause of bladder symptoms.
- They give information, not treatment, and are used selectively — not everyone with bladder symptoms needs them.
- The test involves thin tubes (catheters) and filling the bladder; it can be undignified and a little uncomfortable but is usually brief.
- The bladder sometimes behaves normally during the test, so a normal result does not always explain your day-to-day symptoms.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your specialist will give you advice for your situation.
Can clarify the cause of bladder symptoms when this is uncertain
Routine urodynamic testing is not needed for everyone with bladder symptoms, and is the wrong step when the diagnosis is already clear and treatment can...
You may feel the tubes and a sense of fullness as the bladder fills, and be asked to cough or pass urine. Tell the team if anything is too uncomfortable.
A clear explanation of the findings and what they mean for treatment.
You may feel the tubes and a sense of fullness as the bladder fills, and be asked to cough or pass urine. Tell the...
You can usually go home or back to work straight away. Drinking water helps flush the bladder and reduce stinging.
Some stinging, needing to go more often, and traces of blood in the urine are normal and usually settle within a...
The findings are often discussed soon after the test, with a full report sometimes taking a little longer. You...
What are urodynamic studies?
Urodynamic studies are a group of bladder tests that measure how your bladder fills, stores and empties, and how it behaves when there is pressure on it (for example when you cough). They are used to understand the cause of bladder symptoms such as leaking, urgency, frequency or difficulty emptying.
The tests give information, not treatment. They are most useful when the diagnosis is unclear, when symptoms are mixed, when there is difficulty emptying the bladder, when there is anterior or top-of-vagina prolapse, or before some surgery for urinary leakage. UK guidance (NICE NG123) recommends using them selectively, not as a routine test for everyone with bladder symptoms, partly because some people find them unpleasant.
What they cannot do is fix the problem or always give a single clear answer. Sometimes the bladder behaves normally during the test even though you have symptoms day to day.
This guide explains what the tests involve and what they can and cannot show. It does not replace a personal discussion with your clinician.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Simple vs full bladder testing
| Test | What it involves | When it is used |
|---|---|---|
| Flow test + bladder scan | Passing urine; an ultrasound | Often the first, simple step |
| Cystometry + pressure-flow | Thin tubes; bladder filled | When more detail is needed |
| Video urodynamics | As above, plus X-ray pictures | Selected complex cases |
Many people only need the simple tests. Fuller testing is reserved for when it will change the plan.
Preparing for your test
- Complete a bladder diary beforehand if asked, recording what you drink and how much urine you pass.
- Ask whether to stop any bladder medicines (such as oxybutynin, tolterodine, solifenacin or mirabegron) in the days before, as advised.
- Tell the clinic if you might have a urine infection, are pregnant, or could be pregnant (especially before any X-ray version).
- Arrive with a comfortably full bladder if you have been asked to, so a flow test can be done.
- Wear clothing that is easy to change out of, and bring a sanitary pad in case of light spotting afterwards.
- List your medicines and any allergies, including allergy to latex or to the fluid used in X-ray tests.
- Ask what the test will involve so you know what to expect, and that you can ask for a chaperone.
What happens
Urodynamic studies are done in a clinic, usually without any anaesthetic. You will often start by passing urine into a special toilet that measures your flow, followed by an ultrasound scan to check how much urine is left.
For the main test, two very thin tubes are gently passed — one into the bladder through the water pipe (urethra) and one into the back passage or vagina — to measure pressures. The bladder is then slowly filled with sterile fluid while you say when you first feel the need to go and when it feels full. You may be asked to cough or move to see whether urine leaks or the bladder contracts on its own. Finally, you pass urine with the tubes in place so the team can measure the pressures during emptying. The tubes are then removed.
The whole appointment usually takes around 45 to 60 minutes. It can feel undignified and a little uncomfortable, but it is not usually painful and is over fairly quickly. The team will explain the findings, often soon afterwards.
Is this test right for me?
A good consultation should explore whether it's the right choice for you now — including reasons to wait or consider something else.
May not be suitable if…
- Routine urodynamic testing is not needed for everyone with bladder symptoms, and is the wrong step when the diagnosis is already clear and treatment can start without it.
- It should usually be delayed if you currently have a urine infection, which can give misleading results.
- It is not a treatment, so it will not help on its own if what you need is therapy, medicine or surgery.
- Some tests that used to be used (such as the Q-tip, Bonney, Marshall and Fluid-Bridge tests) are no longer recommended for assessing incontinence.
Delay or rearrange if…
- You have a current urine infection — this should be treated first.
- You are pregnant or might be, especially before any X-ray (video) version of the test.
- You have not completed a requested bladder diary, which adds important information.
- Your symptoms are changing rapidly and an up-to-date picture is needed.
Alternatives to discuss
- A bladder diary and symptom assessment alone, which is often enough
- A simple flow test and bladder scan without the fuller study
- Starting conservative treatment (lifestyle, bladder training, pelvic floor physiotherapy) first
- A trial of medicine for an overactive bladder before any testing
- Specialist review rather than testing if symptoms point clearly to a cause
Before you decide
Use this as a shared-decision checklist. The aim is not just “can this be done?”, but whether it is right for you, now, with the risks and alternatives clearly understood.
What matters most to me?
Think about symptoms, daily life, work, caring responsibilities, sport, fertility, travel, appearance and anxiety — the right choice depends on your priorities, not just the medical facts.
What are all my options?
Ask about waiting, monitoring, medicines, rehabilitation, a smaller or larger procedure, a different test, NHS referral, or a second opinion where that would help.
What would make me pause?
Active infection, pregnancy, unstable medical problems, smoking, medicines that increase bleeding, poor support at home, or feeling pressured are all reasons to slow down and get tailored advice.
What happens if I do nothing today?
For some problems, waiting is safe; for others, delay can make treatment harder. A good consultation should explain the trade-off in plain English.
Benefits
- Can clarify the cause of bladder symptoms when this is uncertain
- Can distinguish between different types of leaking and urgency
- Can show whether the bladder empties properly or is partly blocked
- Helps plan or avoid surgery for urinary leakage by guiding the right treatment
- Can prevent an operation that would not help, by showing the real problem
Risks & complications
- Mild discomfort as the tubes are passed and while the bladder is filled
- Needing to pass urine more often for a short time afterwards
- Traces of blood in the urine for a short time
- Feeling exposed or embarrassed during the test
- A urine infection afterwards, causing burning, frequency or cloudy urine
- Temporary stinging when passing urine for a day or so
- The test not reproducing your symptoms, so it does not fully explain them
- A more troublesome urine infection needing antibiotics
- Brief difficulty passing urine after the test
- With video urodynamics, exposure to a small dose of X-ray radiation
- An allergic reaction to the X-ray fluid, where it is used
The main thing to know is that this is an information test, not a treatment, and it does not always give a single clear answer — sometimes the bladder behaves normally during the test even though you have symptoms. The most common downsides are short-lived discomfort and a small chance of a urine infection. Ask your clinician what the result will change, and what happens if it is normal or does not match your symptoms.
Published figures to discuss
Urodynamic studies are low-risk, so there are no meaningful 'success' rates and only small risks. The honest points are about accuracy and discomfort rather than complications: a urine infection afterwards is uncommon, short-lived bladder symptoms are common, and the test does not always reproduce your day-to-day symptoms. UK guidance limits the test to situations where it will change the plan, partly because some people find it unpleasant.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Urine infection after urodynamic testing | Often reported around 1-6% in lower-risk modern series, higher in some high-risk groups | Risk is higher with catheter use, recurrent UTI, abnormal urine before the test, neurological bladder problems or incomplete bladder emptying. | Cochrane — antibiotics to reduce infection after urodynamic studiescochrane.orgPublished figure |
| Temporary stinging, frequency or small amount of blood in urine | Common short-term symptoms | Usually settles with fluids; persistent burning, fever or worsening symptoms should prompt a urine test. | Cochrane — antibiotics to reduce infection after urodynamic studiescochrane.orgSource-linked context |
| Antibiotics reducing bacteria in urine after testing | Cochrane found bacteriuria around 4% with prophylaxis versus 12% without in included trials | Routine antibiotics are not always used; many units reserve them for higher-risk patients to avoid unnecessary antibiotic use. | Cochrane — antibiotics to reduce infection after urodynamic studiescochrane.orgPublished figure |
| Test not reproducing day-to-day symptoms | Recognised limitation | A normal or unclear test does not always mean symptoms are not real; results must be interpreted with the history and bladder diary. | Guide sourcesClinical context |
These are literature figures, not a personalised prediction. Your own risks and likely benefits depend on your circumstances, your health, and how your care is carried out and followed up.
What happens afterwards
There is usually no real recovery. Most people go straight back to their normal day, perhaps drinking plenty of water to flush the bladder and ease any stinging.
- Stinging when passing urine for a day or so
- Needing to go more often for a short time
- Light spotting or traces of blood in the urine
- No lasting effect on the bladder
Aftercare
- Drink plenty of water for the rest of the day to flush the bladder.
- Expect mild stinging and a little blood in the urine, which usually settle within 24 hours.
- Restart any bladder medicines you were asked to stop, as advised.
- Watch for signs of a urine infection, such as burning, cloudy or smelly urine or feeling unwell.
- Contact your GP or the clinic if symptoms of infection develop or do not settle.
- Make sure you know how and when you will get your results.
- Go back to discuss the results and agree the next step.
- A completed bladder diary, if you were asked to keep one
- A note of bladder medicines stopped and when to restart them
- A sanitary pad for light spotting afterwards
- Plenty of water to drink afterwards
- A list of questions about what the result will change
- The clinic or GP contact details in case of infection symptoms
⚠ Get urgent help if…
- Being unable to pass urine at all after the test (seek urgent help)
- A high temperature, shivering or feeling very unwell (possible serious infection)
- Severe or worsening burning, or heavy or continuing blood in the urine
- Tummy or back pain with a fever after the test
- Cloudy, smelly urine with feeling unwell that does not settle
Who to contact: your clinician, clinic or test provider first (keep their number to hand). For urgent advice when you can't reach them, call NHS 111. In an emergency, call 999.
General guidance — it doesn't replace the specific advice your specialist gives you.
Results & realistic expectations
A useful result explains why you have your bladder symptoms — for example, an overactive bladder, leaking with effort (stress incontinence), a blockage, or a bladder that does not empty fully — and helps choose the right treatment, including whether surgery is likely to help.
What the test cannot do is guarantee a clear answer. Sometimes the bladder behaves normally during the test even though you have symptoms day to day, and sometimes more than one problem is present. A normal or unclear result does not mean your symptoms are not real; it helps your clinician decide what to do next.
The result reflects how your bladder is behaving around the time of the test. It is most useful soon afterwards for planning treatment. If your symptoms change a lot over time, or you have new symptoms later, the test may need repeating to give an up-to-date picture before any further treatment.
Related tests, treatments or support
Urodynamic studies are often done alongside other assessments, such as a bladder diary, urine tests for infection, and an examination for prolapse, because bladder symptoms and prolapse often go together. The results are usually considered together with these when planning treatment.
Follow-up & long-term care
After the test you should be told the findings and given a plan, with a follow-up to discuss treatment options. If surgery for urinary leakage is being considered, the urodynamic result is one of the things used to decide whether it is likely to help. You should know who to contact if you develop signs of a urine infection.
Repeat, follow-on and what comes next
- The test sometimes needs repeating if a urine infection or technical problem affected the result.
- A normal or unclear result may mean trying treatment and reassessing rather than testing again immediately.
- If symptoms change over time, an up-to-date test may be needed before further treatment.
- More than one bladder problem can be present, which can complicate the picture.
Ask what happens if the result is unclear or needs repeating, and what is included if further tests or follow-up are needed.
What good aftercare looks like
- A clear explanation of the findings and what they mean for treatment.
- Advice on drinking water and watching for signs of a urine infection.
- A named contact if infection symptoms develop or do not settle.
- A plan that links the result to the next step, whether lifestyle, physiotherapy, medicine or surgery.
- Clear information on when and how you will get the full report.
What affects the cost
Costs vary a great deal between people and providers, and we don't publish prices. What matters is understanding what drives the cost and making sure your quote is complete. The main things that affect it:
- The clinic and the staff time needed for the test
- Which tests are done (flow test and scan alone, or the fuller study with tubes)
- Whether video (X-ray) urodynamics is needed
- Who reports the results and how quickly
- A follow-up appointment to discuss the findings
- Any urine tests done before or after the study
- What tests are included and who performs them
- Whether the fuller study with tubes, or video urodynamics, is part of the price
- Who reports the results and how soon
- A follow-up appointment to discuss findings and plan treatment
- What happens if the result is inconclusive or needs repeating
- What happens, and who you contact, if you develop a urine infection afterwards
- The cancellation policy
On the NHS? Urodynamic studies are available on the NHS when clinically needed and are used selectively; private testing is sometimes used for a quicker appointment or alongside private treatment.
You're entitled to your total cost in writing — including reports, follow-up and what happens if the result is inconclusive — before you decide.
Consent traps and marketing red flags
These are not small details. They are often where patients lose choice, time to reflect, or realistic expectations.
Consent traps
- Being tested routinely when the diagnosis is already clear and the result would not change treatment.
- Not being warned that the test can be undignified and uncomfortable.
- Not being told that a normal result does not always explain day-to-day symptoms.
- No clear plan for who explains the results and what happens next.
- Not being told about the small radiation dose if video (X-ray) urodynamics is used.
Marketing red flags
- Offering urodynamic testing routinely to everyone with bladder symptoms.
- Presenting the test as a treatment rather than an investigation.
- Promising it will always find a clear cause.
- Pushing straight to surgery on the basis of the test without discussing other options.
Choosing a specialist safely
- Check the specialist is on the GMC Specialist Register for this area.
- Make sure they work at a CQC-registered service, and look for membership of the relevant Royal College or professional body.
- You're entitled to time to consider and to have your questions answered before you agree — the specialist who looks after you should explain it, not a salesperson.
- Be wary of pressure: time-limited offers or deposits taken before you've had time to think are red flags, not bargains.
- You're entitled to your total cost in writing — including any follow-up — before you decide.
Questions to ask your medical professional
Take this to your consultation. A good specialist will welcome every one of these.
- Why do I need this test, and what will the result change?
- What happens if the result is normal or does not match my symptoms?
- Will the simple tests do, or do I need the fuller study with tubes?
- Should I stop any of my bladder medicines beforehand, and when do I restart them?
- How and when will I get the results, and who will explain them?
- If I am considering surgery for leakage, how will this test help decide?
- Are you on the GMC Specialist Register for this area, and which Royal College or professional body are you a member of?
- Will you be the specialist who carries out my test, and who looks after me afterwards?
- What are the risks for someone like me, and how often do your own patients have a problem or need it repeated or redone?
- What does a realistic result look like — and what can this test not achieve?
- What are my options, including waiting, doing nothing for now, or choosing a different approach?
- Can I have written information, results and aftercare instructions in a format I can use, including any accessibility or communication support I need?
- What is the total cost in writing, including any follow-ups, and how much time do I have to decide?
Frequently asked questions
Does everyone with bladder problems need urodynamic studies?
Is the test painful?
What happens if the result is normal?
Will I get a urine infection?
Do I need to stop my bladder medicines first?
Can I have urodynamic studies on the NHS?
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How we made this page
Medically reviewed by a GMC-registered consultant. Written in plain English, checked against NHS, NICE, GMC and relevant Royal College / specialist-society guidance, and kept under review. No clinic paid to appear on this page, and we publish no pricing. This is general information to help you prepare — it is not a substitute for advice from your own clinician. How we review our guides →
Source hierarchy: UK regulator and NHS/NICE guidance first, then relevant Royal College or specialist-society guidance, then peer-reviewed evidence for procedure-specific figures where available.
Sources & standards: NICE NG123 — Urinary incontinence and pelvic organ prolapse in women (urodynamic testing) NICE NG123 — Evidence review: urodynamic assessment before surgery for stress urinary incontinence NHS — Urinary incontinence: diagnosis Milton Keynes University Hospital NHS — Urodynamics studies (patient leaflet) Antibiotic prophylaxis for urodynamic testing — systematic review (PMC) Cochrane — antibiotics to reduce infection after urodynamic studies
Reviews reflect patients' experience of care, not clinical outcomes. For procedure volumes and outcome data see PHIN.
Last medically reviewed 2026-09-21. Spotted something wrong or out of date? Report an error in this guide.
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