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Gastroscopy

A gastroscopy is a test where an operator (a doctor or nurse) looks into the upper part of your gut (the upper gastrointestinal tract). The upper gut consists of the oesophagus (gullet), stomach and duodenum. The operator uses an endoscope to look inside your gut. Therefore, the test is sometimes called endoscopy.

What happens during a gastroscopy?

An endoscope is a thin, flexible, telescope. The endoscope is passed through the mouth, into the oesophagus and down towards the stomach and duodenum. The tip of the endoscope contains a light and a tiny video camera so the operator can see inside your gut. The endoscope also has a ‘side channel’ down which various instruments can pass. These can be manipulated by the operator. For example, the operator may take a small sample (biopsy) from the inside lining of the stomach by using a thin ‘grabbing’ instrument which is passed down a side channel.

Why might I need a gastroscopy?

A gastroscopy may be advised if you have symptoms such as recurring indigestion or heartburn, pains in the upper abdomen, repeated vomiting, difficulty swallowing, or other symptoms thought to be coming from the upper gut.

Conditions which can be confirmed or ruled out include:

  • Oesophagitis (inflammation of the oesophagus). The operator will see areas of redness on the lining of the oesophagus.
  • Duodenal and stomach ulcers. An ulcer looks like a small, red crater on the inside lining of the duodenum or stomach.
  • Duodenitis and gastritis (inflammation of the duodenum and stomach).
  • Cancer of the stomach and oesophagus.
  • Various other rare conditions.

What happens during a gastroscopy

Gastroscopy is usually done as an outpatient ‘day case’. It is a routine test which is commonly done. The operator may numb the back of your throat by spraying on some local anaesthetic, or give you an anaesthetic lozenge to suck. You may be given a sedative to help you to relax. This is usually given by an injection into a vein in the back of your hand. The sedative can make you drowsy but it does not ‘put you to sleep’. It is not a general anaesthetic.

You lie on your side on a couch. You are asked to put a plastic mouth guard between your teeth. This protects your teeth and stops you biting the endoscope. The operator will then ask you to swallow the first section of the endoscope. Modern endoscopes are quite thin and easy to swallow. The operator then gently pushes it further down your oesophagus, and into your stomach and duodenum. The video camera at the tip of the endoscope sends pictures to a screen. The operator watches the screen for abnormalities of the oesophagus, stomach and duodenum. Air is passed down a channel in the endoscope into the stomach to make the stomach lining easier to see. This may cause you to feel ‘full’ and want to belch.

The operator may take one or more biopsies (small samples) of parts of the inside lining of the gut – depending on why the test is done and what they see. This is painless. The biopsy samples are sent to the laboratory for testing, and to look at under the microscope. The endoscope is then gently pulled out.

A gastroscopy usually takes about 10 minutes. However, you should allow at least two hours for the whole appointment, to prepare, give time for the sedative to work (if you have one), for the gastroscopy itself, and to recover. A gastroscopy does not usually hurt, but it can be a little uncomfortable, particularly when you first swallow the endoscope.

Preparing for a gastroscopy

You will get instructions from The GI Unit before your test. These instructions will commonly include.

  • You should not eat for 4-6 hours before the test. The stomach needs to be empty. (Small sips of water may be allowed up to two hours before the test.)
  • If you have a sedative you will need somebody to accompany you home.
  • Advice about medication which may need to be stopped before the test.

What can I expect after a gastroscopy?

Most people are ready to go home after resting for half an hour or so.

If you have had a sedative – you may take a bit longer to be ready to go home. The sedative will normally make you feel quite pleasant and relaxed. However, you should not drive, operate machinery or drink alcohol for 24 hours after having the sedative. You will need somebody to accompany you home and to stay with you for 24 hours until the effects have fully worn off. Most people are able to resume normal activities after 24 hours. . The result from any biopsy may take a few days which can delay the report being sent. The operator may also tell you what they saw before you leave. However, if you have had a sedative you may not remember afterwards what they said.

Contact us

To ask a question about a gastroscopy or to book an appointment, contact our specialist team available Monday – Friday 8am – 6pm and on Saturday from 9am – 1pm.

Our gastrointestinal specialists team have a dedicated and caring approach and will seek to find you the earliest appointment possible with the correct specialist for your needs.

As this procedure is lead by a Consultant you don’t need a referral from your GP. You can simply refer yourself and book an appointment. Please note we do not accept GP referrals. If you have medical insurance (e.g. Bupa, Axa PPP, Aviva), you will need to contact your insurer for authorisation for any treatment and, in most cases, you will require a referral letter from your GP. If you do not have a GP, then we have an in-house private GP practice that you can use. Alternatively we can suggest the most appropriate course of action for you to take, given your location and individual circumstance.

Call us on 020 7078 3802 or email us at gi.unit@hje.org.uk

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GI Clinic

The GI Unit is supported by a multidisciplinary team of medical and surgical consultants. Our expert team treats and supports patients with any gastrointestinal conditions.

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Patient information

Our Hospital is renowned for providing exemplary levels of care across more than 90 services. From orthopaedics, to urology, our private GP practice and Urgent Care Clinic, our services are led by some of London’s leading Consultants. For more information, and to find a service suitable for your care, find out more about the services that we offer.

Make an enquiry

If you have any questions relating to treatment options or pricing information, get in touch with us by filling out one of our contact boxes or giving us a call on 020 7078 3802.

Our Appointments Team have a dedicated and caring approach to finding you the earliest appointment possible with the best specialist.

If you are self-paying you don’t need a referral from your GP for a consultation. You can simply refer yourself* and book an appointment.

If you have health insurance (e.g. Bupa, Axa Health, Aviva), you will need to contact your insurer to get authorisation before any treatment, and in most cases you will also require a referral letter from your GP.

If you are not registered with a GP, we have an in-house private GP practice you can use. Alternatively, we can suggest the most appropriate course of action for you to take, given your location and individual circumstances.

*Please note – for investigations such as X-rays and MRIs, a referral will be required. However, we may be able to arrange this for you through our on-site private GP.

    Make an enquiry

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