Quick answer: Capsule endoscopy is a painless examination of the small intestine, during which the patient swallows a camera capsule roughly the size of a large vitamin tablet. As the capsule travels through the gut, it takes several images per second of the inside of the intestine, before being passed from the body naturally. The method is particularly suitable for examining parts of the small intestine that are difficult to reach using conventional endoscopy.
For many patients, even the word „endoscopy” is enough to cause fear. The good news is that there is now a gentle, pain-free way to examine the small intestine: capsule endoscopy. This procedure does not require a long, flexible tube — all you need to do is swallow a capsule containing a tiny camera.
This article explains in simple terms exactly what this test is, how it is carried out, when it is recommended, and what the patient can expect. The Endomedix Gastroenterology As experts in this field, our aim is to allay any unnecessary concerns and provide accurate, reliable information.
What is capsule endoscopy?
Capsule endoscopy (also known as video capsule endoscopy) is a modern imaging technique that enables the examination of the inside of the digestive system, primarily the small intestine. The method involves a small, swallowable camera which takes continuous photographs as it passes through the digestive tract.
From a historical perspective, it is worth noting that the first capsule was approved in 2001, and the first such examination was carried out in Hungary as early as 2002. Since then, the technology has advanced considerably and has become a widely used diagnostic tool worldwide.
The camera capsule is roughly the size of a large multivitamin tablet: 24–32 millimetres long and 11–13 millimetres in diameter. This means that most patients can swallow it with a glass of water without any difficulty.
How is the camera capsule constructed?
Despite its tiny size, the capsule contains sophisticated technology. The main components of this device for examining the small intestine are as follows:
- Camera sensor and lens: This captures images of the inside of the intestine.
- Light-emitting diodes: They illuminate the area under examination with white light.
- Element: provides the energy required for operation.
- Radio transmitter: This transmits the recorded images to the external recording unit.
During the examination, the patient usually wears a belt and sensors which receive and store the images transmitted by the capsule. Some more modern types of capsule store the information themselves, so there is no need for an external recording device. The software processes the images at a rate of 3–40 frames per second and is also capable of automatically detecting signs of bleeding.
When is a capsule endoscopy of the small intestine recommended?
The small intestine is the section of the digestive tract which, in conventional gastroscopy and colonoscopy It is difficult to reach. This is precisely why the camera capsule is most valuable in this area. The examination is primarily recommended when other methods have failed to provide a clear answer.
The most common indications include the following:
- Occult gastrointestinal bleeding: If a patient is suffering from iron-deficiency anaemia but upper and lower endoscopy have failed to identify a source of bleeding, the capsule may help to reveal the cause hidden within the small intestine.
- Iron deficiency of unknown origin: Persistent fatigue is often caused by undiagnosed gastrointestinal bleeding.
- Suspected Crohn’s disease: The tiny ulcers visible in the small intestine may be important diagnostic signs.
- Complications of coeliac disease: The capsule helps to accurately assess the condition of the small intestine.
- Screening for tumours of the small intestine: It can detect even the tiniest lesions that other imaging techniques cannot.
It is important to note that capsule endoscopy is primarily a screening (diagnostic) tool. It is not suitable for taking tissue samples or performing procedures; therefore, if the examination reveals any abnormalities, this is often followed by a targeted endoscopy.
How should I prepare for the examination?
Good preparation is key to an accurate result, as the camera can see everything clearly in a clean bowel. The preparation involves several steps, which the specialist always tailors to the individual.
The key points to note are as follows:
- Missing doses of medication: Certain anti-inflammatory drugs (NSAIDs) must be stopped four weeks before the examination to prevent damage to the mucous membrane.
- Liquid diet: It is recommended that you drink only clear fluids in the 24 hours leading up to the examination.
- Preparing the liner: A specialist may prescribe a laxative which thoroughly cleanses the digestive system.
- Swallowing the capsule: The capsule itself can be easily swallowed with a single glass of water.
After swallowing the capsule, the patient must not eat for at least two hours. After this, clear, non-carbonated fluids may be consumed, whilst solid food is permitted four hours after swallowing the capsule. During the examination, movement helps the capsule to progress, but excessively vigorous physical activity should be avoided.
What does the examination involve?
The process itself is surprisingly comfortable for the vast majority of patients. After swallowing the capsule, patients can carry on with most of their everyday activities whilst the device passes through the digestive system at its own pace.
As the camera moves, it continuously captures images, which are stored by the wearable recording unit. The examination usually lasts several hours, during which time the patient remains able to move around. At the end of the procedure, the specialist downloads and evaluates the recorded footage in detail.
Something that reassures many patients is that the capsule is for single use only and is excreted from the body naturally via the stools. In most cases, the patient is not even aware of this, and there is no need to retrieve the capsule.
What are the advantages of capsule endoscopy?
The popularity of the camera capsule is no coincidence. This method offers a number of advantages that make it particularly appealing to patients who are reluctant to undergo surgical procedures.
The main positives:
- Pain relief: The test does not cause any discomfort, as all you have to do is swallow a capsule.
- Safety: This is a minimally invasive procedure that is well tolerated by patients.
- A thorough examination of the small intestine: It also reaches areas that conventional reflection does not.
- Comfort: During the examination, most day-to-day activities can be carried out.
What are its limitations and contraindications?
Although capsule endoscopy offers numerous advantages, it is important to be aware of its limitations as well. The method cannot always replace conventional endoscopy, as the capsule cannot be used to rinse, suction, take samples or perform procedures.
In certain situations, the examination is expressly contraindicated. In the following conditions, an alternative method must be chosen:
- Intestinal stenosis: In the event of a known or suspected narrowing, there is a risk of the capsule becoming lodged. To rule this out, a dissolvable, radiopaque test capsule (patency capsule) may be used.
- Difficulty swallowing: Due to the risk of aspiration (choking), the examination is not recommended in such cases.
- Dementia: may constitute a contraindication due to a lack of the necessary cooperation.
- Pregnancy: In the absence of sufficient data, the test cannot be carried out during pregnancy.
The main risk associated with capsule endoscopy is capsule retention, which most commonly occurs in the event of a stricture. To avoid this, it is important to undergo a thorough examination by a specialist prior to the procedure.
How does Endomedix help?
Selecting the appropriate test is always a matter for a specialist. The Endomedix’s gastroenterology team He has been specialising in the accurate diagnosis of digestive complaints for many years, so he knows exactly which method is most effective in each case.
During a specialist consultation, the doctor will assess your symptoms, review your previous medical records, and decide whether capsule endoscopy or another examination is warranted. Our aim is not only to provide you with a report, but also to give you an easy-to-understand explanation and clear guidance on what to do next.
If you have persistent digestive problems or are suffering from iron deficiency of unknown cause, do not delay seeking medical advice. Book an appointment for a consultation with a gastroenterologist at Endomedix, and take the first step towards peace of mind.
Frequently asked questions about capsule endoscopy
Is capsule endoscopy painful?
No. Capsule endoscopy is a completely painless procedure. The patient simply has to swallow a capsule containing a small camera with a glass of water, which is similar to taking a large tablet. Most people do not even notice the capsule moving through their digestive tract.
How long does the capsule remain in the body?
The capsule travels through the digestive system at its own pace and is passed naturally in the stools. The camera capsule is for single use only and is usually passed from the body within a few hours. In most cases, the patient does not even notice when it is passed.
What happens if the test reveals an abnormality?
Capsule endoscopy is a diagnostic examination which is not suitable for taking samples or performing procedures. If the examination reveals any abnormalities, the specialist will often recommend a targeted endoscopy, during which a tissue sample can be taken or, if necessary, treatment can be carried out.
Who should not undergo capsule endoscopy?
The examination is contraindicated in cases of known or suspected intestinal stricture, difficulty swallowing, dementia and pregnancy. In these cases, an alternative diagnostic method must be chosen. The final decision is always preceded by a consultation with a specialist.
What is the difference between capsule endoscopy and conventional endoscopy?
Conventional endoscopy is carried out using a flexible tube, which can be used for both taking samples and performing procedures. Capsule endoscopy, on the other hand, is only suitable for imaging, but it is painless and can reach sections of the small intestine that are difficult to examine.
