Capsule endoscopy uses a swallowed, vitamin-sized capsule containing a camera, lights, batteries and a transmitter. As natural bowel movement carries it along, it takes several pictures a second for 8 to 12 hours and sends them to a recorder worn on a belt. It is passed in the stool and not retrieved.
It is the best first-line way to see the lining of the small intestine, roughly 5 metres that ordinary gastroscopy and colonoscopy cannot reach. It can only look: it cannot take biopsies, treat bleeding or be steered, and it does not replace colonoscopy for bowel cancer screening.
What Capsule Endoscopy shows
The recording reveals sources of hidden bleeding such as fragile vessel clusters (angioectasias), ulcers, and tumours; the ulcers and narrowing of small bowel Crohn's disease; damage from anti-inflammatory painkillers; polyps in inherited polyposis syndromes; and changes of coeliac disease that is not responding to diet. It finds a cause in about half to two thirds of people with obscure bleeding, with the highest yield when performed within days of a bleed.
When Capsule Endoscopy is recommended
- Iron deficiency anaemia or gut bleeding with normal gastroscopy and colonoscopy
- Suspected small bowel Crohn's disease when other tests are inconclusive
- Assessing the extent or healing of known Crohn's disease
- Surveillance in Peutz-Jeghers and other polyposis syndromes
- Coeliac disease with continuing symptoms despite a strict diet
- Suspected small bowel tumour on a scan
Limits and situations where another test is better:
- Known or suspected bowel narrowing, obstruction or fistula, unless a dissolvable patency capsule passes first
- Swallowing disorders, unless the capsule is placed by endoscope
- Pregnancy
- Ordinary abdominal pain or diarrhoea with normal blood and stool tests, where the yield is very low
- Pacemakers and defibrillators are generally compatible, but tell the team
How to prepare
- Clear fluids only from lunchtime the day before, then a bowel cleansing drink as directed
- Nothing by mouth for 10 to 12 hours before swallowing the capsule
- Stop iron tablets 5 to 7 days ahead; they blacken the bowel lining
- Ask about pausing anti-inflammatory painkillers and adjusting diabetes medication
- Wear a loose two-piece outfit for the sensor belt
What happens during the test
Sensors or a belt are fitted around your waist and you swallow the capsule with water, often with a few drops of anti-foaming agent. You can leave and walk about, which helps transit. Clear fluids are allowed after 2 hours and a light meal after 4. Avoid strong magnetic fields, such as MRI, until the capsule has passed. You return the recorder after 8 to 12 hours or the next morning. The capsule usually leaves unnoticed within 1 to 3 days.
Results and next steps
A gastroenterologist reviews tens of thousands of images, which takes 1 to 2 hours, so reports are commonly ready in 2 to 5 working days. If a lesion is found, the next step is often device-assisted enteroscopy (a long endoscope with balloons) to biopsy or treat it, or CT or MR enterography, medical therapy or surgery depending on the finding.
- Test time: 8 to 12 hours of recording; 30 minutes in clinic
- Results ready: 2 to 5 working days
- Back to everyday activity: None
Safety and risks
- Capsule retention behind a narrowing, in about 1 to 2 percent overall and more in known Crohn's disease; it may need endoscopic or surgical removal
- Incomplete study because the battery runs out before the capsule reaches the colon
- Missed lesions from poor preparation, fast transit or the camera facing away
- Accidental inhalation of the capsule, very rare
Arranging Capsule Endoscopy in Türkiye
It works well within a short visit: swallowed in the morning, recorder back the same evening, and you need not stay for the report, which can be sent on. It is most worthwhile as part of an anaemia or Crohn's work-up in a unit that also offers balloon enteroscopy, so that anything found can be dealt with. Do not fly or have an MRI until you are confident the capsule has passed; an abdominal X-ray can confirm if unsure.
Send your previous reports and the question you want answered and a Clinic-Y coordinator replies within 24 hours with suitable teams and written, all-inclusive proposals side by side. Reviewing your case is free.
Frequently Asked Questions
What if I do not see the capsule pass?
Most people do not notice it. If there is doubt after 2 weeks, or you develop pain and vomiting, an abdominal X-ray settles the question.
Can it replace colonoscopy?
Not routinely. A colon capsule exists, but it needs heavier bowel preparation and cannot remove polyps.
What is a patency capsule?
A dissolvable dummy of the same size, swallowed first when narrowing is possible. If it passes intact, the real capsule is considered safe.
Does it hurt?
No. The capsule is smooth and you cannot feel it moving.