Medically reviewed by Prof. Dr. Aamer Nadeem Chaudhary, M.B.B.S., D.M.R.D., F.C.P.S. (Diagnostic Radiology), Consultant, Al-Nasar Lab & Diagnostic Centre. Updated November 2026.
Quick answer: Fluoroscopy is a moving X-ray shown live on a screen. For digestive problems it is combined with a chalky drink called barium, which coats the inside of the gut so it shows clearly. A barium swallow looks at the food pipe and a barium meal at the stomach and the first part of the bowel. Most studies need 6 hours of fasting and take 15 to 30 minutes.
Book fluoroscopy: call 0300 0341944. Fluoroscopy is performed at our main Johar Town campus. Please confirm the exact study and preparation when booking.
Why a moving X-ray?
An ordinary X-ray is a single still picture. Fluoroscopy records continuously, so the radiologist can watch barium travel through you as you swallow.
That matters because many swallowing and stomach problems are about function, not structure. The food pipe might look normal on a still image but squeeze in an uncoordinated way, or allow acid and food back up. Only a test that watches movement in real time can show that.
Which study is which?
| Study | What it examines | Common reasons |
|---|---|---|
| Barium swallow | Throat and oesophagus (food pipe) | Difficulty swallowing, food sticking, suspected narrowing, hiatus hernia, reflux |
| Barium meal | Stomach and duodenum | Upper abdominal pain, vomiting, suspected outlet narrowing |
| Barium follow through | Small intestine | Suspected Crohn’s disease, small bowel narrowing |
| Barium enema | Large bowel | Now largely replaced by colonoscopy or CT colonography |
Your referral letter will name the study. If it is unclear, call before your appointment, because preparation differs.
Barium study or endoscopy?
A fair question, since endoscopy is now the standard test for many upper digestive problems.
Endoscopy passes a camera into the gut. It shows the lining directly and allows a biopsy, which makes it the better test when ulcers, inflammation or a growth are suspected.
A barium swallow is often more useful when the main complaint is difficulty swallowing. It shows how the whole swallow works, picks up subtle narrowing and pouches in the throat, and shows movement disorders of the oesophagus. It is also a sensible option for people who cannot have, or would rather avoid, an endoscopy.
The two answer different questions, and gastroenterologists use both.
How to prepare
- Do not eat or drink for 6 hours before a barium swallow or barium meal, unless told otherwise. Food in the stomach mixes with the barium and hides detail
- Small sips of water to take essential medicines are usually allowed. Ask about diabetes medicines specifically, as fasting may need a dose adjustment
- Tell the team if you are or might be pregnant, since fluoroscopy uses X-rays
- Mention any previous stomach or oesophageal surgery
- Bring endoscopy reports and previous scans
- Small bowel and large bowel studies have their own preparation, which will be given at booking
What happens during the test
You change into a gown and stand or lie on the X-ray table. You are given barium to drink. It is thick and chalky, sometimes flavoured, and most people find it tolerable rather than pleasant.
The radiologist watches the screen as you swallow and may ask you to drink in different positions, turn, or lie on your side. The table may tilt. These movements spread the barium and show areas that would otherwise be hidden.
For a barium meal you may also be given granules that fizz and produce gas. This stretches the stomach so its lining shows in more detail. Try not to burp, as that lets the gas escape.
Afterwards
- You can eat normally straight away
- Drink plenty of water for a day or two to help the barium pass
- Your stools will look pale or white for a day or two. This is expected
- Barium can cause constipation. If you have not opened your bowels within two days, speak to your doctor
Radiation
Fluoroscopy uses more radiation than a single chest X-ray because it records over a period of time, but the dose for a routine barium study is modest and kept as low as practical. Our guide to X-ray radiation safety explains dose in plain terms.
Fluoroscopy at Al-Nasar Lab
Al-Nasar Lab & Diagnostic Centre has served Lahore since 1996 and holds ISO 15189:2022 accreditation from the Pakistan National Accreditation Council. Digital X-ray and fluoroscopy are available at our Johar Town campus, alongside abdominal ultrasound and CT. Related reading: H. pylori testing for stomach pain.
See our accreditations, find your nearest location, or contact us to book.
Frequently Asked Questions
Do I need to fast for a barium swallow?
Usually yes, for 6 hours. Food in the stomach mixes with the barium and hides detail.
What does barium taste like?
Thick and chalky. Most people find it tolerable, and it is sometimes flavoured.
Why are my stools white after a barium test?
That is the barium passing through, and it is expected for a day or two. Drink plenty of water.
Is a barium swallow better than endoscopy?
They answer different questions. A barium swallow is often better for swallowing difficulty. Endoscopy is better when a biopsy may be needed.
Can I have fluoroscopy if I am pregnant?
It uses X-rays, so it is avoided in pregnancy unless essential. Tell the team if you are or might be pregnant.
This article is for general information and is not a substitute for medical advice. Please discuss your results with a qualified doctor.
