Fluoroscopy (including barium studies)
A moving X-ray test that uses a contrast liquid such as barium to watch how part of the body works in real time — for example the gullet, stomach or bowel.
✓ Medically reviewed by a GMC-registered consultant · last reviewed September 2026 · next review September 2027 · how we review
In short
- Fluoroscopy is a moving X-ray, usually with a contrast such as barium, to watch how the gullet, stomach or bowel works.
- It uses ionising radiation (X-rays), kept as low as possible — broadly several months of background radiation, or a few years for some bowel studies.
- Tell the team before the test if you are or might be pregnant, as X-rays of the tummy area are usually avoided in pregnancy.
- Many questions are now answered by endoscopy or CT instead, so ask why this test has been chosen and what it will show.
A plain-English summary. The detail — including risks and recovery — is below.
At a glance
A general guide. Your radiologist will give you advice for your situation.
Shows movement and function in real time, which a single X-ray cannot.
Fluoroscopy cannot take a tissue sample (biopsy), so it is the wrong test when a sample is needed — that requires endoscopy.
You can usually eat and drink as normal and go home or back to work. There are no restrictions on driving as sedation is not usually used.
Clear written advice on fluids, fibre and what to do if you become constipated.
You can usually eat and drink as normal and go home or back to work. There are no restrictions on driving as...
Barium passes through your system, sometimes turning stools white or pale. Drink plenty of fluids and eat fibre to...
Any bloating settles and bowel habit returns to normal. If you become very constipated, contact your GP or the...
A report goes to the clinician who referred you, who will discuss the findings and any next steps with you.
What is fluoroscopy (including barium studies)?
Fluoroscopy is a type of X-ray that shows movement, like a live X-ray 'video', rather than a single still picture. It lets a radiologist watch a part of the body working in real time on a screen.
To make soft tissues such as the gullet, stomach and bowel show up, you are usually given a contrast agent. This is often barium, a chalky liquid you swallow or that is passed into the bowel, or sometimes a different water-based contrast. Common examples include a barium swallow (the gullet), a barium meal (the stomach), a barium follow-through (the small bowel) and a barium enema (the large bowel). Fluoroscopy is also used to guide some other procedures.
Unlike ultrasound, fluoroscopy does use ionising radiation, because it is a form of X-ray. The dose is kept as low as possible and the team only uses the test when the benefit clearly outweighs the small risk. The amount is broadly comparable to several months, and for some bowel studies a few years, of natural background radiation, depending on the test.
Because it uses X-rays, there are important precautions in pregnancy. Always tell the team before the test if you are, or might be, pregnant, as the test may be changed, delayed or done differently. Many questions that barium studies used to answer are now often assessed with endoscopy (a camera test) or CT instead, so it is worth asking why this particular test has been chosen.
Types, options & approaches
There may be different ways to do this. The right approach depends on the clinical question and your circumstances.
Barium study vs camera test (endoscopy)
| Point | Barium / fluoroscopy | Endoscopy |
|---|---|---|
| Uses radiation? | Yes (X-rays) | No |
| Shows movement? | Yes, in real time | No, but gives a direct view |
| Can take a sample? | No | Yes (biopsy) |
| Sedation? | Not usually | Often offered |
These tests answer different questions. Endoscopy or CT now replaces some barium studies; your clinician will explain which is right for you.
Preparing for your scan
- Follow the instructions in your appointment letter carefully, as preparation differs between tests.
- For upper-gut tests (swallow or meal), you usually must not eat or drink for several hours beforehand so the stomach is empty.
- For a bowel enema, you may need to follow a special diet and take strong laxatives beforehand to empty the bowel.
- Tell the team before the test if you are, or might be, pregnant — X-rays of the tummy area are usually avoided in pregnancy.
- Mention diabetes, kidney problems, allergies, or medicines such as those for diabetes, as instructions may change.
- Wear comfortable clothing without metal fastenings near the area, and expect to change into a gown.
- Allow time afterwards; you can usually eat and drink straight away unless told otherwise.
What happens
You will be asked to change into a gown and remove jewellery near the area being examined. For a barium swallow or meal you stand or lie on a special tilting X-ray table and drink the barium, sometimes with fizzy granules that make gas to open up the stomach for a clearer view. The radiologist watches on a screen and takes pictures as you swallow or as the table is tilted to move the contrast around.
For a bowel study, you lie on the table and a soft tube is gently placed into the back passage so the contrast can be passed into the bowel; you may feel bloated and need to hold the contrast in for a short time while pictures are taken. You may be asked to change position so the contrast spreads evenly.
The test usually takes around 15 to 45 minutes depending on what is being looked at. You may feel some bloating or wind. Afterwards you can normally eat and drink as usual, and you will be told how the barium may affect you over the next day or two. The findings are written into a report rather than given on the day.
Is this scan 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…
- Fluoroscopy cannot take a tissue sample (biopsy), so it is the wrong test when a sample is needed — that requires endoscopy.
- X-ray studies of the tummy or pelvis are usually avoided in pregnancy unless the benefit clearly outweighs the risk.
- A barium study may be unsuitable if a hole in the bowel (perforation) is suspected, when water-based contrast is used instead.
- It may not be the best test where a direct view of the lining or small surface changes is important.
Delay or rearrange if…
- You are, or might be, pregnant and the study is not urgent.
- You have not completed the required fasting or bowel preparation.
- You have an acute bowel obstruction or suspected perforation that needs urgent assessment first.
- Your kidney function, diabetes medicine or allergy history needs checking before contrast is given.
Alternatives to discuss
- Endoscopy (a camera test), which gives a direct view and can take samples, without radiation.
- CT scan or CT colonography for some bowel and abdominal questions.
- Ultrasound or MRI where appropriate, which use no ionising radiation.
- No test, with a review of symptoms, if the result would not change management.
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
- Shows movement and function in real time, which a single X-ray cannot.
- Outlines the gullet, stomach or bowel to reveal narrowings, blockages, pouches or reflux.
- Can assess swallowing and how the gut moves, useful for swallowing problems.
- Does not usually need sedation, so most people recover quickly and can drive.
- Can guide other procedures accurately using live X-ray.
- Provides information that helps plan further tests or treatment.
Risks & complications
- Bloating, wind or mild discomfort during and after the test, especially with fizzy granules or an enema
- White or pale stools for a day or two as the barium passes through
- Constipation after barium, which usually eases by drinking plenty of fluids
- Exposure to a small amount of radiation, balanced against the benefit of the test
- Needing another test (such as endoscopy or CT) if the study does not fully answer the question
- An allergic-type reaction to contrast, which is uncommon
- Significant constipation or impaction from barium if fluids are not increased afterwards
- Leakage of barium outside the bowel if there is an unsuspected hole (perforation), which is why water-based contrast is sometimes used instead
- A more serious contrast reaction needing treatment
The two things to weigh are the small radiation dose and, for barium, the bowel after-effects. The dose is kept as low as possible and is broadly equivalent to several months of natural background radiation for an upper-gut study, and a few years for some bowel studies. Tell the team before the test if you might be pregnant. Drink plenty of fluids afterwards to clear the barium. Ask whether a test without radiation, such as endoscopy or ultrasound, could answer the same question.
Published figures to discuss
Radiation dose and diagnostic value both vary with the type of study and the equipment. Doses are kept as low as reasonably possible and are justified case by case. The figures below are broad comparisons to natural background radiation, drawn from UK guidance, rather than precise individual doses, which your department can provide.
| Figure | Reported range | How to interpret it | Source / confidence |
|---|---|---|---|
| Radiation dose, barium swallow or meal | Broadly equivalent to a few months of natural background radiation | Kept as low as possible; the exact dose varies and your department can advise. | Guide sourcesClinical context |
| Radiation dose, barium enema | Broadly equivalent to around 3 years of natural background radiation | Higher than upper-gut studies; this is one reason colonoscopy or CT colonography is often preferred now. | Guide sourcesClinical context |
| Aspiration during swallow studies | Uncommon but important in people with swallowing impairment | The test may be modified or supervised by speech-and-language therapists when aspiration risk is the question. | NHS — Barium enemanhs.ukSource-linked context |
| Constipation or barium retention | Uncommon, higher with dehydration, immobility or bowel narrowing | Hydration advice and red flags for abdominal pain or failure to open bowels should be given. | NHS — Barium enemanhs.ukSource-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 usually no real physical recovery and most people return to normal activity straight away. 'Afterwards' is mainly about the barium passing through over a day or two, keeping well hydrated, and then waiting for the report.
- White or pale stools for a day or two as barium passes
- Mild bloating or wind that settles
- Needing to drink more fluids than usual to keep things moving
- No immediate result, with a report following afterwards
Aftercare
- Drink plenty of fluids over the next day or two to help clear the barium.
- Eat fruit, vegetables and fibre to reduce the risk of constipation.
- Expect white or pale stools for a short time — this is normal.
- Resume your usual medicines as advised, including any diabetes medicine that was adjusted.
- Contact your GP or the department if you become very constipated or have not passed the barium.
- Make sure you know who will give you the result and when.
- Keep any follow-up appointment or further test that is arranged.
- Appointment letter read for fasting or bowel preparation
- Pregnancy possibility flagged to the team in advance
- Diabetes, kidney or allergy details noted for the team
- Plenty of fluids planned for afterwards
- Comfortable clothing without metal near the area
- A note of how and when results will be given
⚠ Get urgent help if…
- Severe tummy pain, a swollen hard abdomen or being unable to pass barium or open your bowels
- Vomiting that does not stop, or vomiting blood
- Difficulty breathing, swelling of the face or throat, or a widespread rash after contrast (possible reaction)
- A high temperature or feeling very unwell after the test
- No bowel movement for several days after a barium study despite fluids and fibre
- Severe or worsening rectal bleeding after an enema
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 radiologist gives you.
Results & realistic expectations
A useful result outlines the shape and movement of the part examined and can show problems such as narrowing, a pouch, reflux, a blockage or a structural change. The radiologist interprets the moving images and still pictures together.
Fluoroscopy has limits. It looks at structure and movement from the outside of the lining, so it cannot take a tissue sample and may miss small or surface changes that a camera test would see. A normal study does not rule out every problem, and an abnormal one often needs another test, such as endoscopy or CT, to confirm what is going on. Your clinician will explain what the findings mean for you.
The result reflects the situation on the day of the test. Symptoms can change, and some conditions develop later, so a normal study does not mean future tests will never be needed. If symptoms continue or worsen, your clinician may arrange a repeat or a different test.
Related tests, treatments or support
Fluoroscopy is often one step in a sequence of tests. A barium study may be combined with or followed by endoscopy (a camera test) to look directly and take samples, or by a CT scan for more detail. Your clinician decides the right order and combination for your symptoms.
Follow-up & long-term care
Results are not given on the day. A report is written and sent to the clinician who referred you, usually within days to a couple of weeks, and they will then discuss it with you and arrange any further test or treatment. Make sure you know who is responsible for giving you the result and how to get in touch if you do not hear.
Repeat, follow-on and what comes next
- A study that does not fully answer the question often leads to endoscopy or CT.
- A technically limited study (for example poor bowel preparation) may need repeating.
- An abnormal finding usually needs another test to confirm and to take samples.
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 advice on fluids, fibre and what to do if you become constipated.
- A named contact and a defined route and time for getting the report.
- A plan for any further test such as endoscopy or CT if needed.
- Advice on restarting any medicine that was paused for the test.
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 type of study (swallow, meal, follow-through, enema or guided procedure)
- The contrast used and any bowel preparation needed
- The seniority of the radiologist performing and reporting the study
- Whether a same-day report is included
- Any follow-up consultation to discuss the findings
- Whether further tests such as endoscopy or CT are then needed
- The study fee and who performs and reports it
- The cost of contrast and any bowel preparation
- Whether a written report goes to your GP or referring clinician
- A follow-up appointment to discuss results
- What happens, and what it costs, if another test is needed afterwards
- How and when results are provided
On the NHS? Fluoroscopy and barium studies are available on the NHS when clinically needed; some questions are now answered by endoscopy or CT instead, and people sometimes choose private imaging for speed.
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 being told the test uses ionising radiation, or what the dose roughly compares to.
- Not being asked about, or not disclosing, possible pregnancy before an abdominal X-ray study.
- Not knowing that a barium study cannot take a sample, unlike endoscopy.
- No clear advice on managing barium afterwards or who will give the result.
Marketing red flags
- Promoting barium studies as a complete check of the gut.
- Not mentioning radiation or pregnancy precautions.
- Offering the test without considering whether endoscopy or CT is more appropriate.
- Implying a normal study rules out all bowel or stomach problems.
Choosing a specialist safely
- Check the radiologist 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 radiologist 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 radiologist will welcome every one of these.
- Why is this test better for my symptoms than an endoscopy or CT scan?
- How much radiation does this involve, and is it justified for me?
- What will the result change about my care?
- What happens if the study is normal but my symptoms continue?
- What should I do if I become constipated or unwell afterwards?
- Who will give me my result, and when?
- 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 radiologist who carries out my scan, 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 scan 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 fluoroscopy use radiation?
Is it safe in pregnancy?
Why barium and what does it do to me?
Will it hurt?
Could I have a camera test instead?
When will I get my results?
What should I do after a barium test?
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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: NHS — Barium enema GOV.UK (UKHSA) — Ionising radiation: dose comparisons GOV.UK (UKHSA) — Patient dose information: guidance RCR — Clinical radiology standards and guidance NHS — X-ray
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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