Endoscopic ultrasound (EUS)
A test that combines a flexible camera with an ultrasound scanner on its tip to look closely at the gut wall and nearby organs such as the pancreas, and to take samples if needed.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- EUS combines a camera with an ultrasound scanner to look closely at the gut wall and nearby organs such as the pancreas.
- It can take a small sample (fine needle aspiration) during the same test, so cells can be examined.
- It is usually done with sedation and throat spray, so you must not drive or be alone for the rest of the day.
- Risks are low overall, but taking samples — especially from the pancreas — slightly raises the chance of bleeding or inflammation (pancreatitis).
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.
Gives a very close, detailed view of the gut wall and nearby organs such as the pancreas.
It may be unsafe if you cannot tolerate sedation or have a very high anaesthetic risk that is not managed.
You rest in a recovery area until the sedation wears off. Staff check you and offer a drink and a snack when it is safe.
Clear written warning signs after the test, especially if a sample was taken, and who to call.
You rest in a recovery area until the sedation wears off. Staff check you and offer a drink and a snack when it is...
You go home with a responsible adult. You should not drive, drink alcohol, work or make important decisions, and...
Any sore throat, bloating or drowsiness usually settles. Eat lightly at first if your throat is sore.
If a sample was taken, watch for warning signs such as severe pain or fever. Sample results are processed in the...
What is an endoscopic ultrasound (EUS)?
An endoscopic ultrasound, or EUS, is a test that puts an ultrasound scanner on the tip of a flexible camera (an endoscope). Passing it through the mouth into the gullet, stomach and the first part of the small bowel lets the specialist scan from the inside, very close to structures that are hard to see from outside the body.
It is used to look in detail at the wall of the gut and at nearby organs such as the pancreas, bile ducts, gallbladder and lymph nodes. It helps assess lumps, cysts and swellings, and how deeply a cancer has grown or whether it has spread to nearby lymph nodes, which helps with staging.
During the same test, a very fine needle can be passed through the endoscope to take a small sample (fine needle aspiration or biopsy) from, for example, the pancreas or a lymph node, so the cells can be examined in the laboratory.
EUS is usually done with sedation and throat spray rather than a general anaesthetic. It is a detailed test, but like all camera tests it carries some risks, and taking samples adds a little to those risks.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Options at a glance
These are the main approaches described in this guide. The right option depends on the diagnosis, your goals and what your clinician thinks is safe.
Diagnostic EUS (scan only)
The ultrasound camera is used to look at the gut wall and nearby organs, without taking a sample. Used to assess lumps, cysts and how deep a problem goes.
EUS with fine needle aspiration (EUS-FNA)
A very fine needle is passed through the camera to draw off cells from a target such as the pancreas or a lymph node, so they can be examined.
EUS with fine needle biopsy (EUS-FNB)
A slightly different needle takes a small core of tissue rather than just cells, which can give more information in some cases.
Staging EUS
Used to assess how far a cancer of the gullet, stomach or pancreas has grown and whether nearby lymph nodes are involved, to help plan treatment.
Preparing for your procedure
- You will be asked not to eat for several hours beforehand, and to stop clear fluids a couple of hours before, as instructed.
- Bring a list of your medicines and tell the unit about blood thinners well in advance, as these may need adjusting.
- Tell the unit if you have diabetes, so your food and medicines can be planned around fasting.
- Tell the unit about heart or lung problems, sleep apnoea, or any reaction to sedation, as these affect how sedation is given.
- Arrange for a responsible adult to take you home and stay with you, as you cannot travel alone or drive after sedation.
- Plan to take the rest of the day off and avoid important decisions, as sedation affects judgement.
- Ask whether samples are likely to be taken, as this can make the test a little longer and slightly raise the risks.
What happens
You lie on your left side and are given sedation through a small tube in your arm, and usually a throat spray to numb your throat; this is not a general anaesthetic, but you will feel relaxed and drowsy. A mouthpiece protects your teeth and the camera.
The specialist (the endoscopist) passes the thin, flexible ultrasound camera through your mouth into your gullet, stomach and the first part of the small bowel. Gagging as it goes down is normal and settles. They scan the gut wall and nearby organs, and may take still pictures and measurements. The test usually takes about thirty minutes.
If a sample is needed, a very fine needle is passed down the camera to draw off cells or take a tiny piece of tissue from the target, such as the pancreas or a lymph node; you should not feel this. Taking samples makes the test a little longer. Afterwards you rest in a recovery area until the sedation wears off.
Is this procedure 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…
- It may be unsafe if you cannot tolerate sedation or have a very high anaesthetic risk that is not managed.
- A known narrowing or blockage of the gullet can make passing the camera unsafe.
- It is the wrong test where the question can be answered by a less invasive scan.
- Sampling may be avoided where bleeding risk is very high until that is corrected.
Delay or rearrange if…
- Blood-thinning medicines need adjusting before sampling.
- You have an active infection or are acutely unwell on the day.
- You have not fasted as instructed, which makes sedation less safe.
- You have no responsible adult to take you home and stay with you.
Alternatives to discuss
- Cross-sectional imaging such as CT or MRI/MRCP, which scan from outside the body.
- A standard gastroscopy where only the gut lining needs to be seen.
- A different way of taking a sample, such as a CT-guided biopsy, in some cases.
- No test, with monitoring, if a finding is low-risk and being watched.
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.
Comfort, sedation or contrast choices
If local anaesthetic, sedation, contrast or pain relief is used, ask what is planned, why, and what it means afterwards.
Benefits
- Gives a very close, detailed view of the gut wall and nearby organs such as the pancreas.
- Helps assess lumps, cysts and swellings that are hard to see on other scans.
- Can take a sample of cells or tissue in the same test to reach a diagnosis.
- Helps work out how far a cancer has grown and whether lymph nodes are involved (staging).
- Avoids a general anaesthetic in most cases.
- Can guide treatment decisions and help avoid more invasive procedures.
Risks & complications
- A sore throat for a day or two
- Bloating or trapped wind from air used during the test
- Drowsiness for the rest of the day from sedation
- Needing to wait days for any sample results
- An inconclusive sample that does not give a firm answer
- Minor bleeding from a sample site
- A reaction to the sedation, such as low breathing or blood pressure
- Inflammation of the pancreas (pancreatitis) when the pancreas is sampled
- A tear (perforation) of the gut wall, which may need treatment or an operation
- Significant bleeding needing treatment or transfusion
- Infection, sometimes needing antibiotics
EUS is low risk when only scanning is done. Taking samples adds a little risk, and sampling the pancreas carries a small chance of pancreatitis (inflammation of the pancreas), which is usually mild but occasionally more serious. Tears and serious bleeding are rare. Because you have sedation, the day-of safety rules — no driving, no alcohol and not being alone — matter. Ask whether samples are planned and what the specific risks are for you.
Published figures to discuss
Diagnostic EUS is very low risk; taking samples adds a small amount of risk, and sampling the pancreas carries a particular, usually mild, risk of pancreatitis. Reported rates vary with the target sampled, the technique and your health, so the figures below are broad guides from published series rather than guarantees.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Pancreatitis after sampling the pancreas | Commonly reported as roughly 1 to 2 in 100, and under 1 in 100 in some series; older reports quote up to about 7 in 100 | Usually mild and settles within a few days, but occasionally more serious. | Complications of EUS-guided fine needle aspiration: a narrative review (PMC)pmc.ncbi.nlm.nih.govPublished figure |
| Significant bleeding after fine needle sampling | Uncommon; severe bleeding reported in well under 1 in 100 in large pancreatic series | Most bleeding is minor; serious bleeding needing treatment is rare. | Complications of EUS-guided fine needle aspiration: a narrative review (PMC)pmc.ncbi.nlm.nih.govPublished figure |
| Perforation (tear) of the gut | Rare; in the region of 1 in 1,000 or less for diagnostic tests | Higher where the gullet is narrowed; may need treatment or an operation. | Complications of EUS-guided fine needle aspiration: a narrative review (PMC)pmc.ncbi.nlm.nih.govPublished figure |
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
Recovery is mainly from the sedation rather than the test itself. You rest until you are alert, then go home with someone to look after you, and any sample results follow later.
- A mild sore throat for a day or two
- Bloating or wind that settles
- Feeling drowsy or forgetful for the rest of the day after sedation
- A wait of several days for sample results
Aftercare
- Do not drive, drink alcohol, operate machinery or sign legal documents for the rest of the day after sedation.
- Have a responsible adult stay with you overnight after the test.
- Eat and drink lightly at first if your throat is sore, then return to normal as comfortable.
- Take any prescribed medicines as advised, and ask when to restart blood thinners if they were paused.
- Watch for warning signs over the next day or two, especially if a sample was taken.
- Attend your follow-up to discuss any sample or staging results.
- Fasting instructions followed
- Blood thinners discussed and adjusted if advised
- A responsible adult to take you home and stay overnight
- Rest of the day cleared of driving, work and decisions
- Soft foods at home for a sore throat
- Unit's contact number saved for warning signs
⚠ Get urgent help if…
- Severe or worsening tummy or chest pain
- Pain when swallowing that is getting worse
- Vomiting blood or passing black, tarry stools
- A high temperature, chills or feeling very unwell
- A swollen, hard or very tender tummy
- Breathlessness, a fast heartbeat or feeling faint
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 good result is a clear, detailed view of the area of concern, and — where a sample was taken — enough cells or tissue to give a diagnosis. Some findings can be talked through with you on the day, once the sedation has worn off, but laboratory results from samples usually take several days.
EUS is very informative, but it cannot answer everything. A sample can occasionally be inconclusive, and a normal result does not rule out every condition. Staging from EUS is an estimate that may be refined by other tests or by what is found at any later procedure.
The result reflects your situation at the time of the test. In conditions that are monitored, such as some pancreatic cysts, EUS may be repeated over time to watch for change. Your specialist will advise whether and when a repeat or further test is sensible.
Related tests, treatments or support
EUS is often part of a wider work-up, alongside scans such as CT or MRI and other camera tests, particularly when assessing the pancreas, bile ducts or staging a cancer. In some cases it is combined with another procedure, such as ERCP, in the same session, which your team will explain.
Follow-up & long-term care
Any sample or staging results are usually discussed with you at a follow-up appointment or by letter within days to a couple of weeks. If a problem is found, the next step — such as further tests, a team discussion or treatment — is explained. You should be given clear contact details for any concerns in the meantime.
- Repeat EUS to monitor conditions such as some pancreatic cysts
- Further tests or scans to confirm or stage a finding
- Ongoing management of any condition diagnosed
Repeat, follow-on and what comes next
- A sample is occasionally inconclusive and may need repeating.
- Staging from EUS can be refined by other tests or at a later procedure.
- A finding may need a further test or procedure to confirm or treat it.
- Some conditions are monitored with repeat EUS over time.
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
- Clear written warning signs after the test, especially if a sample was taken, and who to call.
- Confirmation of a responsible adult and overnight support after sedation.
- A results appointment that explains findings and any sample results in plain language.
- A clear plan for any further test, staging discussion or treatment.
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:
- Whether the test is a scan only or includes fine needle sampling
- Sedation and the staff and monitoring it requires
- Laboratory examination of any samples taken
- The specialist's and unit's fees
- A follow-up consultation to discuss results
- Any further test or procedure needed after the result
- The fee for the test and whether sampling is included or charged separately
- Sedation and recovery charges
- Laboratory fees for examining samples
- A follow-up consultation to discuss results
- What happens, and what it costs, if a sample is inconclusive
- What happens, and what it costs, if a complication occurs
On the NHS? EUS is available on the NHS when clinically indicated, such as assessing a pancreatic lump or staging a cancer; private access may be used for speed, but the test is the same.
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
- Not explaining that sampling, especially of the pancreas, adds a small risk such as pancreatitis.
- Not setting out the sedation and driving rules clearly.
- Not discussing the chance of an inconclusive sample and what happens next.
- Not explaining who reviews the results and how you will get them.
Marketing red flags
- Describing EUS as a without risks or routine scan when sampling carries real risks.
- Not mentioning the pancreatitis risk before pancreatic sampling.
- Downplaying the need for sedation and a responsible adult afterwards.
- Implying a normal result rules out every condition.
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 EUS rather than another scan?
- Are you planning to take a sample, and from where?
- What are the specific risks for me, including pancreatitis if my pancreas is sampled?
- What will this result change about my treatment?
- What happens if the sample is inconclusive?
- When and how will I get my results?
- 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 procedure, 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 procedure 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
Will I be asleep for the test?
Why can't I drive home afterwards?
Does taking a sample hurt?
Is sampling the pancreas risky?
How is EUS different from a normal scan?
Can I have this 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: Buckinghamshire Healthcare NHS — Having an EUS and fine needle aspiration/biopsy Severe bleeding and perforation are rare after EUS-FNA for pancreatic masses (PubMed) Complications of EUS-guided fine needle aspiration: a narrative review (PMC)
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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