Capsule Gastroscopy in China: Stomach Check Without Sedation

Short answer: magnetically controlled capsule gastroscopy (磁控胶囊胃镜) lets a doctor look inside your stomach without a tube and without sedation. You swallow a camera capsule about the size of a large vitamin pill, and the doctor steers it around your stomach with an external magnet while the images appear on a screen. It is a reasonable option if you need your stomach checked but do not want to be sedated. It is not a replacement for a gastroscopy: it cannot take a biopsy or remove anything, so if it finds something, you will still need a conventional gastroscopy.

This guide is for people who have been told they need a gastroscopy, or want one as part of a check-up, and would rather not be sedated. It explains how the capsule exam works at Taikang Qianhai Hospital in Shenzhen, what the evidence says, who should not have it, and when the ordinary scope is still the better choice.

A sedated gastroscopy is safe. Why do some people look for something else?

A sedated ("painless") gastroscopy is routine in China. You are usually asleep or very drowsy during a short procedure, and the doctor can take biopsies and remove small polyps in the same session. For most people it is the most complete way to examine the oesophagus, stomach and duodenum. Read what a painless GI endoscopy in China involves and how Chinese hospitals keep gastroscopy safe.

Still, some people would rather not have one. The reasons we hear most often are:

• they have had a bad experience with sedation, or do not like the idea of being put to sleep;
• they react badly to certain sedative or pain-relief drugs;
• they need to drive, work or travel on the same day (after sedation you should not drive for 24 hours);
• they are very anxious about having a scope put down the throat.

For people in these situations, a capsule exam of the stomach may be a reasonable alternative.

How a magnetic capsule gastroscopy works

The capsule contains a camera and a light. Unlike older capsules, which simply drift with gravity and the movement of the gut, a magnetic capsule can be steered from outside the body. At Taikang Qianhai Hospital, the exam room in the health check-up centre uses a robotic magnet system. You lie on a padded table, and a large magnet head above you moves the capsule around inside your stomach.

1. Before the exam: you drink water so that your stomach expands and its lining can be seen clearly. Some hospitals also give a drink that clears bubbles.
2. Swallowing the capsule: you swallow it with water, the way you would swallow a large pill.
3. The exam: you lie on the table and the doctor steers the capsule with the magnet. You may be asked to turn onto your side or back, and to drink more water. Images stream to the doctor's screen in real time.
4. Afterwards: the capsule is not retrieved. It switches off and leaves your body naturally in your stool, usually within a few days.

A US surgical society's technology assessment of one magnetically controlled stomach capsule system gives about 15 to 20 minutes for the exam itself.

What the evidence says

The best-known comparison study was a multicentre trial in China. It enrolled 350 patients with upper-abdominal symptoms. Each patient had a magnetic capsule exam and, two hours later, a standard gastroscopy. For focal lesions in the stomach, the capsule had a sensitivity of 90.4% and a specificity of 94.7%. In that study, it did not miss any significant lesions, such as tumours or large ulcers. Of the 350 patients, 335 (95.7%) said they preferred the capsule.

A NICE evidence briefing on the same technology (UK National Institute for Health and Care Excellence) found that the published studies suggest similar diagnostic accuracy to conventional gastroscopy and better tolerance. It also noted that the studies were done in China, none in the UK, and some involved healthy volunteers, so the results may not apply directly to NHS settings.

What a capsule cannot do

• No biopsy, no treatment. A capsule only takes pictures. It cannot take a tissue sample, remove a polyp or stop bleeding. If it finds something that needs any of these, you will need a conventional gastroscopy afterwards.
• The oesophagus is not seen as well. The capsule passes through the gullet quickly. In one multicentre study, views of the lower oesophagus were adequate in only 60% of patients. If your doctor is concerned about reflux damage or Barrett's oesophagus, a gastroscopy is usually more appropriate.
• Subtle early changes are less certain. Gastroscopy today is also used to look for subtle precancerous changes in the stomach lining. Whether current capsules can detect these reliably is not yet known.

We book it as a stomach exam. A standard gastroscopy also looks at the first part of the small intestine (the duodenum); ask the hospital whether your capsule report covers it.

Who should not have it

Taikang Qianhai Hospital gives patients a written list of contraindications. It is based on Chinese clinical guidance for capsule endoscopy and for MRI. The hospital lists the following as absolute contraindications, which means the exam is not done:

• anyone who cannot have, or would refuse, abdominal surgery, because surgery is the way to remove a capsule that gets stuck;
• a heart pacemaker, unless it is a newer MRI-compatible model;
• an implanted electronic device, such as a cochlear implant, a drug infusion pump or a nerve stimulator, or magnetic metal anywhere in the body;
• pregnancy.

The hospital lists the following as relative contraindications, which means the doctor decides case by case:

• known or suspected blockage, narrowing or fistula in the digestive tract;
• difficulty swallowing, or being unable to swallow a large pill;
• being unable to drink a large amount of water;
• being unable to lie flat or to turn over on the table when asked;
• previous major surgery on the digestive tract, such as a partial gastrectomy.

The hospital's sheet also lists possible complications: the capsule getting stuck, allergy to the capsule's plastic coating, acute bowel obstruction, bleeding or perforation, and accidentally inhaling the capsule into the windpipe. In the 350-patient study above, 5 people reported side effects. Tell us about your medical history, surgeries and any implants when you enquire. The hospital's doctor makes the final decision.

When a conventional gastroscopy is still the better choice

• You already know, or strongly suspect, that a biopsy or polyp removal will be needed. Examples include a lesion seen on another scan, follow-up of a known ulcer or polyp, and testing for H. pylori from a tissue sample.
• Your main concern is the oesophagus, for example long-standing heartburn or Barrett's oesophagus surveillance.
• You also need a colonoscopy. A sedated gastroscopy and colonoscopy can be done in one session. See our same-day gastroscopy and colonoscopy guide.
• Any of the contraindications above applies to you.

If a capsule finds something, you will need a second procedure. If you are travelling for a short trip, plan for that possibility. Ask us whether a follow-up gastroscopy could be arranged before you leave.

How to prepare (Taikang Qianhai Hospital's instructions)

• The day before: no smoking or alcohol. Avoid spicy food and food that is hard to digest. Peel fruit and vegetables before eating them. Plain rice porridge or noodles are recommended.
• From 8 pm the night before: do not eat. Do not drink anything coloured, including tea, honey water, malt drinks, fruit juice, cola, milk, soup, yoghurt and coffee. Water and other clear, colourless drinks, such as sugar water or glucose water, are allowed.
• In the week before: do not have a barium test.
• If you are also having an MRI scan: schedule it before the capsule exam.
• Tell the doctor about your past illnesses and surgeries before the exam, especially digestive problems and heart conditions, including stents and pacemakers.
• Regular medication: the hospital's instructions say long-term medication is taken after the exam. Do not stop or delay any regular medicine without first checking with the doctor who prescribed it and the hospital.

After the exam

• After a stomach-only exam, you can eat normally straight away.
• Until the hospital has confirmed that the capsule has passed, you must not have an MRI scan or go near other strong magnetic fields.
• If you are not sure the capsule has passed after 14 days, contact the hospital doctor who did your exam.
• If you fly home before you have seen the capsule pass, tell us. Guidance for these exams describes checking with a hand-held capsule locator, and an X-ray is another way to check.

Capsule gastroscopy vs sedated gastroscopy at a glance

	Magnetic capsule gastroscopy	Sedated (painless) gastroscopy
Sedation	None, you stay awake	Yes, you are usually asleep
Tube down the throat	No	Yes, while you are asleep
Biopsy or polyp removal	Not possible	Possible in the same session
Oesophagus	Seen less reliably	Examined in full
After the exam	Normal food and activity; no MRI until the capsule has passed	Rest until the sedation wears off; no driving for 24 hours
Main safety point	Capsule retention; not suitable with pacemakers or implants	Sedation risks, assessed by the anaesthetist

Booking a capsule gastroscopy through SinoCareLink

SinoCareLink is a medical-travel coordinator, not a hospital. In Shenzhen, we arrange the magnetic capsule exam at Taikang Qianhai Hospital, and we book it for the stomach only. The capsule gastroscopy appointment at Taikang Qianhai Hospital is from US$699 and is booked through the Capsule Gastroscopy Appointment option on our GI endoscopy booking page. Before you travel, we confirm in your written plan the hospital, the date, the preparation instructions and what is included.

Not sure which test is right for you? Tell us your symptoms, history and travel dates. If a conventional painless gastroscopy turns out to suit you better, we will say so and can arrange that instead. For more background, see our capsule endoscopy in China explainer and our guide to the 8 types of GI endoscopy.

Frequently asked questions

Is capsule gastroscopy as accurate as a normal gastroscopy?

For the stomach, it comes close. In a multicentre study of 350 patients in China, the magnetically controlled capsule found 90.4% of the stomach lesions that a standard gastroscopy found, and in that study it did not miss any significant lesions, such as tumours or large ulcers. But it cannot take a biopsy, and it does not examine the oesophagus as reliably, so it is not a replacement for a gastroscopy.

Does capsule gastroscopy need sedation?

No. You stay awake, swallow the capsule with water and lie on an examination table while a doctor steers it with an external magnet. Because there is no sedation, you do not need time to recover from sedative drugs afterwards.

Who should not have a magnetic capsule gastroscopy?

The hospital's own instructions list pregnancy, a heart pacemaker (unless it is a newer MRI-compatible model), implanted electronic devices such as a cochlear implant, drug pump or nerve stimulator, magnetic metal in the body, and anyone who could not or would not have abdominal surgery if the capsule got stuck. Known or suspected bowel blockage or narrowing, swallowing problems and major stomach surgery are reasons for extra caution.

What happens if the capsule finds something?

The capsule can only take pictures. If it shows something that needs a tissue sample, a polyp removed or a closer look, you will need a conventional gastroscopy.

How long does the capsule stay in my body?

It usually passes in your stool within a few days. Until the hospital has confirmed that it has left your body, you must not have an MRI scan or go near other strong magnetic fields. If you are not sure it has passed after 14 days, contact the hospital.

Can I eat normally after a stomach-only capsule exam?

Yes. Taikang Qianhai Hospital's instructions say you can eat normally as soon as a stomach-only exam is finished. If you take regular medication, the instructions say to take it after the exam, but do not stop or delay any medicine without checking with the doctor who prescribed it first.

Sources

• Taikang Qianhai Hospital, Shenzhen: written patient instructions, "Magnetically controlled capsule gastroscopy: pre- and post-examination notes" and "Precautions for magnetically controlled capsule gastroscopy" (in Chinese), received October 2026.
• Liao Z, et al. Accuracy of magnetically controlled capsule endoscopy, compared with conventional gastroscopy, in detection of gastric diseases. Clin Gastroenterol Hepatol 2016. PubMed 27211503
• NICE. NaviCam for diagnosing gastrointestinal tract conditions (MIB104). nice.org.uk
• Jiang X, et al. Standardized examination procedure of magnetically controlled capsule endoscopy. VideoGIE 2019. PMC6545453
• SAGES. NaviCam Stomach Capsule System: a technology and value assessment. sages.org
• Letter: Magnet-controlled capsule endoscopy, the international experience. iGIE 2023. doi.org/10.1016/j.igie.2023.07.010
• Raju SA, Tai FWD, McAlindon M. Controversies in … capsule endoscopy. Frontline Gastroenterology 2019. PMC7307050
• Mayo Clinic. Capsule endoscopy. mayoclinic.org

This article is general information, not medical advice. Talk to your own doctor before deciding. Whether a capsule exam or a gastroscopy is right for you depends on your symptoms and history, and the hospital's doctors make the final decision.