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What is a Gastroscopy (OGD)?

Upper GI endoscopy, also called OGD (oesophago-gastro-duodenoscopy), ‘gastroscopy’ or simply an ‘endoscopy’, is a test which allows the endoscopist to look directly at the lining of the oesophagus (the gullet), the stomach and around the first bend of the small intestine – the duodenum. In order to do the test, an endoscope is passed through your mouth into the stomach. The endoscope is a thin flexible tube (no larger than a finger) with a bright light and video camera at the end. The endoscopist gets a clear view of the lining of the stomach and can check whether or not any disease is present. Sometimes the endoscopist takes a biopsy – a sample of tissue for analysis under the microscope in the laboratory, the tissue is removed painlessly through the endoscope using tiny forceps.


To allow a clear view, the stomach must be empty. You will therefore be asked not to have anything to eat or drink for at least six hours before the test. When you come to the department, a doctor or nurse will explain the test to you and will usually ask you to sign a consent form. This is to ensure that you understand the test and its implications. Please tell the doctor or nurse if you have had any allergies or bad reactions to drugs or other tests. They will also want to know about any previous endoscopy you have had. If you have any worries or questions at this stage don’t be afraid to ask, the staff will want you to be as relaxed as possible for the test and will not mind answering your queries.

During the procedure

In the examination room you will be made comfortable on a bed, resting on your left side. A nurse will stay with you throughout the test. You will have the option of having a local anaesthetic in a form of spray on the back of your throat to numb it or you may have an injection into your arm to make you feel sleepy and relaxed, but many hospitals now find that the test can be performed without any sedation as the endoscopes have become much smaller and easier to swallow. To keep your mouth slightly open, a plastic mouthpiece will be put gently between your teeth. When the endoscopist passes the endoscope into your stomach it will not cause you any pain, nor will it interfere with your breathing at any time. It may take up to fifteen minutes to examine all the areas of the oesophagus, stomach and duodenum carefully. During this time, some air will be passed down the endoscope to distend the stomach and allow a clearer view. The air is sucked out at the end of the test. If you get a lot of saliva in your mouth, the nurse will clear it using a sucker. When the examination is finished, the endoscope is removed quickly and easily.

After the procedure

You will be left to rest in the unit for at least thirty minutes. You will be given a drink but if you have had your throat numbed by a spray, you will have to wait until your swallowing reflex is back to normal – this usually takes no more than an hour. After this you can eat and drink normally. The back of your throat may feel sore for the rest of the day. You may also feel a little bloated if some of the air has remained in your stomach. Both these discomforts will pass and need no medication.

Going home

If you only had throat spray, you can leave the hospital on your own and resume your normal routine. If you had sedation, it is essential that a responsible adult comes to pick you up and remains with you up until 12 hours. Once home, it is important to rest quietly for the remainder of the day. Sedation lasts longer than you think, so if you have been given an injection during the examination you should not: drive; operate machinery; drink alcohol; or sign legal documentation for 24 hours. The effects of the test and injection should have worn off by the next day, when most patients are able to resume normal activities.

When will I know the results?

In most cases the endoscopist will be able to tell you the results straight after the test or, if you have been sedated, as soon as you are awake, and you will receive a copy of the endoscopy report to take home. However, if a sample (biopsy) has been taken for examination the results may take a few weeks. It is a good idea to have someone with you when you speak to the nurse after the test since, if sedation has been used, people often find they forget everything that has been said to them and many do not recollect having the test at all. Further details of the results and any necessary treatment can be discussed with your general practitioner or hospital specialist – whoever recommended you to have the test.

What to expect after Diagnostic Gastroscopy (OGD)

After diagnostic gastroscopy (OGD) there are minimal side effects, but it is sensible that you are aware of the following:
• Food and drink
Alcohol in combination with any sedation you may have received is more likely to make you much more sleepy that usual. If local anaesthetic was used in your throat, you should not eat or drink until normal sensation returns, usually within an hour of the procedure. A mildly sore throat is no cause for concern and should resolve within 48 hours. Normal food can be taken after the examination, though you may prefer light meals on the day of the examination.

• Pain
Abdominal pain is uncommon after gastroscopy. Some patients have discomfort due to wind in the stomach during the procedure but this subsides rapidly. If you are troubled by more than this, please consult your own GP or contact the Endoscopy Department.

• Activities
If you have been given sedation during the procedure it will make you less alert than usual and you should therefore not drive or make any decisions for the rest of the day. You may resume normal activities on the day after the examination.

• Medications
You may resume normal medications immediately after the gastroscopy. Please ask if you are not sure that a medication is safe.

• Things to report to your doctor

  • Severe pain or vomiting
  • Temperature greater than 38 degrees
  • Redness, tenderness and swelling at the site of the intravenous injection that persists

If you have any worries please do not hesitate to either contact the Endoscopy Department, your own GP or go to your nearest Accident & Emergency Department (taking a copy of the endoscopy report with you).