Capsule endoscopy
A test in which you swallow a tiny disposable camera in a capsule that takes pictures as it passes through your small bowel, an area hard to reach with other camera tests.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- You swallow a tiny disposable camera that photographs your small bowel, an area other camera tests cannot reach.
- It only takes pictures — it cannot take samples or treat anything, so a follow-on test is sometimes needed.
- The main risk is the capsule getting stuck (retention), which is uncommon overall but higher if the bowel is narrowed, for example in Crohn's disease.
- You must not have an MRI scan until the capsule has passed, and you should tell staff if you do not see it pass.
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.
Looks at the small bowel, which standard camera tests cannot reach.
Known or strongly suspected narrowing or blockage of the bowel, unless a dummy capsule has confirmed the path is clear.
You wear the sensor belt and recorder and carry on with a quiet day. You can usually drink and then eat after a few hours, as instructed.
Clear written instructions on what to do if the capsule does not pass, and the MRI restriction.
You wear the sensor belt and recorder and carry on with a quiet day. You can usually drink and then eat after a...
You return or remove the equipment. There are no after-effects from the capsule itself, which keeps moving through...
The capsule passes out naturally in your stool. You can flush it away; you do not need to retrieve or return it.
Do not have an MRI scan. If you have not seen it pass within the time advised, contact the unit, who may arrange...
What is a capsule endoscopy?
A capsule endoscopy is a test in which you swallow a small capsule, a little bigger than a large vitamin tablet, containing a tiny camera. As it travels naturally through your digestive system it takes thousands of pictures of the lining of your small bowel and sends them to a recorder you wear in a belt or shoulder bag.
It is mainly used to look at the small bowel — the long middle part of the gut that a standard gastroscopy or colonoscopy cannot reach. Common reasons include looking for a source of bleeding or unexplained iron-deficiency anaemia, assessing possible or known Crohn's disease, and checking for small bowel growths.
The camera only takes pictures; unlike other camera tests, it cannot take samples (biopsies) or treat anything it finds. If it shows a problem, you may still need another test to sample or treat it. The capsule is single-use and passes out naturally when you open your bowels, usually within a day or two.
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.
Small bowel capsule endoscopy
The most common type, used to examine the lining of the small bowel for bleeding, inflammation such as Crohn's disease, or growths.
Patency (dummy) capsule first
For people at higher risk of the camera getting stuck, a dissolvable dummy capsule is swallowed first to check the path is clear before the real test.
Oesophageal or colon capsule
Less common versions designed to look at the gullet or large bowel, used in selected situations chosen by your specialist.
With bowel preparation
Some units ask you to take a bowel-cleansing preparation beforehand so the pictures of the small bowel are clearer.
Preparing for your procedure
- Follow the unit's instructions on diet beforehand; you are usually asked to eat lightly the day before and then take only clear fluids, then nothing from midnight.
- Stop iron tablets about a week before, as iron can darken the bowel lining and obscure the pictures.
- Ask about constipating medicines, such as some painkillers, which you may be asked to pause before the test.
- Tell the unit if you have swallowing problems, a pacemaker or other implanted device, or known narrowing of the bowel.
- Tell the unit if you are or might be pregnant.
- If you have diabetes, ask how to adjust your food and medicines on the day, as you will be fasting.
- Wear loose, two-piece clothing so the sensor belt and recorder can be fitted comfortably.
What happens
At the unit, a nurse fits a sensor belt and a small recorder, then shows you the capsule and asks you to swallow it with water. It is usually not painful to swallow and you do not feel it as it moves through your gut.
You usually leave the unit and carry on with a quiet day while the capsule records, often for around eight to ten hours. You can normally drink clear fluids after a couple of hours and eat a light meal a few hours later, following the unit's instructions. You should avoid vigorous exercise and not have an MRI scan while the capsule is inside you.
At the end of the recording time you return the equipment, or remove it as instructed. The capsule itself continues through your bowel and passes out naturally in your stool, usually within a day or two; it can simply be flushed away and does not need to be returned. The pictures are then reviewed by a specialist (the endoscopist), and the results follow later.
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…
- Known or strongly suspected narrowing or blockage of the bowel, unless a dummy capsule has confirmed the path is clear.
- Difficulty swallowing, which can make swallowing the capsule unsafe.
- It is the wrong test where a sample or treatment is needed, as the capsule cannot take biopsies.
- Pregnancy, where it is generally avoided.
Delay or rearrange if…
- You have symptoms of a possible bowel blockage that need assessing first.
- You are taking iron or certain constipating medicines that should be paused beforehand.
- You have an MRI scan planned that should be done before, not after, the capsule.
- The bowel preparation has not been completed, which would reduce picture quality.
Alternatives to discuss
- A device-assisted enteroscopy, which can reach parts of the small bowel and take samples or treat findings.
- Cross-sectional imaging such as MRI or CT enterography of the small bowel.
- Repeat or further standard camera tests (gastroscopy, colonoscopy) where appropriate.
- No test, with monitoring, if symptoms are mild and there are no warning signs.
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
- Looks at the small bowel, which standard camera tests cannot reach.
- Helps find a source of bleeding or unexplained iron-deficiency anaemia.
- Assesses inflammation in possible or known Crohn's disease.
- Can detect small bowel growths or other lining changes.
- Usually not painful to swallow and needs no sedation, so you stay alert.
- Avoids the discomfort and sedation of some longer camera tests.
Risks & complications
- The picture quality can be limited if the bowel is not clean, so a clearer answer is not always possible
- It cannot take samples or treat anything, so a further test is sometimes needed
- Mild tummy discomfort or bloating from any bowel preparation
- Not always seeing the capsule pass, which can cause worry
- The capsule does not reach the end of the small bowel within the recording time, so part of it is not seen
- The capsule gets stuck (retention), usually where the bowel is already narrowed
- Findings that need a further, more invasive test to confirm or treat
- Retention that does not clear and needs a procedure or operation to remove the capsule
- Blockage symptoms (severe pain, vomiting, a swollen tummy) if the capsule is stuck
- Difficulty swallowing or, very rarely, the capsule going into the airway
The main test-specific risk is the capsule getting stuck (retention), which is uncommon overall but more likely if the bowel is narrowed, for example in Crohn's disease or after previous surgery. A dummy (patency) capsule is used first when this risk is higher. Crucially, you must not have an MRI scan until the capsule has definitely passed, and you should contact the unit if you have not seen it pass within the time they advise.
Published figures to discuss
Capsule endoscopy is a low-risk test, but the chance of the capsule getting stuck (retention) and the chance of an incomplete study vary with the indication and the state of the bowel. Retention is more common where there is narrowing, such as in Crohn's disease, and is reduced by using a dummy (patency) capsule first. The figures below are broad guides from published series rather than guarantees.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Capsule retention (capsule gets stuck) — overall | Around 1 to 2 in 100 across all indications, and under 1 in 100 in some large reviews | Risk is higher with bowel narrowing and lower when a patency capsule is used first. | Capsule retention: systematic review and meta-analysis (PMC)ncbi.nlm.nih.govPublished figure |
| Capsule retention in Crohn's disease | Roughly 3 to 5 in 100, and higher in some series of established disease | A patency capsule is often used first to reduce this risk. | Capsule retention: systematic review and meta-analysis (PMC)ncbi.nlm.nih.govSource-linked context |
| Incomplete study (capsule does not reach the end of the small bowel) | Reported in roughly 1 to 2 in 10 in some series | Part of the small bowel may not be seen, which can mean a repeat or different test. | Capsule retention: systematic review and meta-analysis (PMC)ncbi.nlm.nih.govSource-linked 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 no physical recovery from the test itself. "Afterwards" mainly means letting the capsule pass naturally, avoiding an MRI scan until it has, and waiting for the pictures to be reviewed.
- No physical after-effects from swallowing the capsule
- Possibly not noticing the capsule pass, which is common
- Mild bloating or loose stools if you took bowel preparation
- A wait of a few weeks for the pictures to be reviewed
Aftercare
- Do not have an MRI scan until you are sure the capsule has passed.
- Watch for the capsule passing in your stool over the next day or two; you can simply flush it away.
- Contact the unit if you do not see it pass within the time they advise, so passage can be checked if needed.
- Resume your normal food, fluids and medicines as the unit instructs.
- Seek urgent help if you develop severe tummy pain, vomiting or a swollen tummy, which could mean the capsule is stuck.
- Attend your follow-up to discuss the results and any further tests.
- Diet and fasting instructions followed
- Iron tablets stopped about a week before
- Any constipating medicines paused as advised
- Loose two-piece clothing for the belt and recorder
- A quiet day planned with no MRI booked
- Unit's contact number saved in case the capsule does not pass
⚠ Get urgent help if…
- Severe tummy pain after the test
- Being sick repeatedly or unable to keep fluids down
- A swollen, bloated tummy
- Not having seen the capsule pass within the time advised
- Difficulty breathing or a persistent cough after swallowing the capsule
- No bowel movements with worsening tummy pain (possible blockage)
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 clear pictures of the small bowel lining that either show the cause of your symptoms — such as a source of bleeding or inflammation — or reassuringly show no significant abnormality. The recording is reviewed carefully by a specialist, which is why results usually take a few weeks rather than being available on the day.
The test cannot take samples or treat anything, so if it finds a problem you may need a further test to confirm or deal with it. A normal result is reassuring but does not completely exclude every condition, especially if part of the small bowel was not fully seen.
The result reflects your small bowel at the time of the test. If your symptoms change or continue, the test may need repeating or a different test arranged, particularly in conditions such as Crohn's disease that are monitored over time. Your specialist will advise whether and when a repeat is sensible.
Related tests, treatments or support
Capsule endoscopy is often used alongside other tests, such as blood tests, a gastroscopy and a colonoscopy, when these have not explained symptoms like bleeding or anaemia. If the capsule finds something, a device-assisted test or scan may follow to sample or treat the area.
Follow-up & long-term care
The recording is reviewed by a specialist after the test, and your results are usually discussed at a follow-up appointment or by letter within a few weeks. If a problem is found, the next step — such as a further test, a scan or treatment — is explained to you. You should know who to contact if you have concerns in the meantime.
- Repeat capsule or other tests over time in monitored conditions such as Crohn's disease
- A follow-on test to sample or treat anything the capsule finds
- Ongoing management of any condition diagnosed
Repeat, follow-on and what comes next
- An incomplete study may need repeating or a different test arranging.
- A finding often needs a follow-on test to take a sample or treat it.
- Repeat capsule tests are sometimes used to monitor conditions over time.
- A retained capsule occasionally needs a procedure or operation to remove it.
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 instructions on what to do if the capsule does not pass, and the MRI restriction.
- A defined route to contact the unit with concerns or blockage symptoms.
- A specialist review of the recording with results explained in plain language.
- A clear plan for any follow-on test or treatment if something is found.
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 capsule device itself, which is single-use
- Whether a dummy (patency) capsule is needed first
- Any bowel-cleansing preparation
- The specialist's time reviewing the recording, which is lengthy
- A follow-up consultation to discuss results
- Any further test needed to sample or treat a finding
- The fee for the test, including the capsule and the recorder
- Whether a patency capsule or bowel preparation is included
- The cost of reviewing and reporting the recording
- A follow-up consultation to discuss results
- What happens, and what it costs, if a further test is needed
- What happens, and what it costs, if the capsule is retained
On the NHS? Capsule endoscopy is available on the NHS when there is a clear clinical reason, such as unexplained bleeding or suspected Crohn's disease; 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 assessing or discussing the risk of the capsule getting stuck before the test.
- Not warning clearly that an MRI scan must be avoided until the capsule has passed.
- Not explaining that the capsule cannot take samples or treat findings.
- Not explaining that part of the small bowel may not be seen.
Marketing red flags
- Presenting the capsule as a complete replacement for all other camera tests.
- Downplaying the risk of retention, especially in people with Crohn's disease.
- Not mentioning the MRI restriction until the capsule has passed.
- Implying a normal result rules out all small bowel disease.
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 is a capsule test the right test for my symptoms?
- Am I at higher risk of the capsule getting stuck, and do I need a dummy capsule first?
- What will you do if the test finds something that needs sampling or treating?
- How and when will I get my results?
- What should I do if I do not see the capsule pass?
- What happens if part of the small bowel is not fully seen?
- 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
Does it hurt to swallow the capsule?
What if I do not see the capsule come out?
Can the capsule get stuck?
Can it take samples or treat what it finds?
Why can't I have an MRI scan afterwards?
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: Frimley Health NHS — Having a capsule endoscopy St Mark's, the National Bowel Hospital — Small bowel video capsule endoscopy Capsule retention: systematic review and meta-analysis (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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