Oesophago-Gastro-Duodenoscopy (OGD)
Important information
Please read all of this leaflet or you may miss important information about your test. If you do not follow the instructions we may need to cancel your test on the day.
What is a Oesophago-Gastro-Duodenoscopy (OGD)?
An OGD looks at your oesophagus (gullet), stomach, and the first part of the small intestines (duodenum). It uses a long flexible telescope (endoscope) with a light and camera on the end.
It is done by a consultant or non-medical clinical endoscopist. The endoscope is passed through the mouth, into the oesophagus, and to the duodenum. Many patients just have local anaesthetic throat spray, but some prefer to have a light sedative. It is not a general anaesthetic.
You will need to arrange for someone to collect you from the unit and stay with you for at least 6 hours.
Trans-Nasal Endoscopy (TNE)
Some patients can have a Trans-Nasal Endoscopy (TNE) where the scope is passed through the nose instead of the mouth. It is usually more comfortable and you can talk during the procedure.
Please ask if you are interested. It may not always be possible.
How long will the OGD procedure take?
OGD usually takes between 5 to 10 minutes. In some cases this may be longer, but this does not mean anything is wrong. You should expect to be in the department 2 to 4 hours. Unfortunately, it may not always be possible to run to time. The staff will try to keep you informed.
Why do I need to have an OGD?
To help your doctor find the cause of your symptoms by looking directly at the lining of the oesophagus, stomach, and duodenum. Your symptoms may include indigestion, reflux, difficulty swallowing, anaemia, vomiting, weight loss, or blood loss.
Finding the cause for your symptoms helps us treat you, and if necessary, decide on further tests.
You may have a gastroscopy as part of ongoing surveillance for Barrett’s or ulcers. During this test the endoscopist may take a biopsy (small sample of tissue) for testing. The sample is removed through the endoscope using tiny forceps and does not hurt.
What are the benefits to this procedure?
To help diagnose and/or treat your condition. It may also help your doctor decide if any further investigations are required.
What if I do not have the OGD or change my mind?
It may be difficult to diagnose your condition or offer suitable treatment. You may find it helpful to discuss the test with your family, friends, and/or GP. If you decide not to go ahead, please let us know.
Can I seek a second opinion?
Yes, please seek advice from your GP or referring consultant.
Is there an alternative to an OGD?
X-rays and CT scans are useful but can miss some diagnoses. OGD directly looks at the lining of your oesophagus, stomach, and duodenum. Biopsies can be taken, and in some cases, treatment can be provided.
What are the risks?
Bleeding: may occur at the site of biopsy or polyp removal (risk of less than 1 in 1000 examinations where this is performed). This usually isn’t too serious and bleeding may stop on its own. If it does not, it can be controlled by cauterization or injection treatment.
Perforation: (or tear in the oesophagus) the risk is about 1 in every 15,000.
Reaction to medication: if you choose to have sedation, this may cause a problem with breathing, heart rate, or blood pressure. You will be monitored during the procedure to look out for this. Medication to reverse the sedation is available and we will support you as needed.
Missed diagnoses: there is a very small risk that the OGD misses an abnormality due to small folds in the lining of the digestive tract. In these areas the views may be less clear.
Pain: most people can cope well with this procedure. It is common to experience discomfort for a short time, however, a small number of patients may have some pain.
Failure to complete the procedure: your comfort and safety are our priority, we will stop at any time if we cannot ensure this, or if there is a problem with equipment (this is rarer).
How do I prepare for my OGD?
Your stomach needs to be empty for the examination to be safe.
On the day of your test, you must not eat any food for 6 hours before your appointment time.
You can continue to drink clear liquids until 2 hours before your appointment time.
You should wear loose, comfortable clothing, as you may feel slightly bloated with air following your procedure.
If you have a heavy cold, sore throat, or chest infection, you may need to postpone your OGD until you feel better. Please contact the endoscopy department for advice.
If you prefer to have sedation, please make sure a responsible adult is available to collect you from the department and stay with you for at least 6 hours. Make sure you bring their contact details so we can let them know you are ready to be collected.
What about my medication?
You should take all your usual medication at the normal times with small sips of water unless you have been advised not to. Some medications need to be stopped or adjusted 1 to 2 weeks before your appointment. Please notify the department as soon as possible if you:
- have diabetes
- take medication to thin your blood/prevent clotting like warfarin, apixaban, rivaroxaban, dabigatran, edoxaban, clopidogrel
- take long term steroids
- take iron tablets
- take weight loss injections
Why have I been asked if I have a pacemaker/internal cardiac defibrillator?
Implanted permanent pacemakers or cardiac defibrillators latest device checks will be reviewed before your appointment. Please notify the department if you have one.
Do I need to bring anything with me?
- A list of your medications and any you may need to take while you are in the department, such as insulin, inhalers, or GTN spray.
- You are advised not to bring valuables with you. Your belongings will stay with you throughout your stay.
What happens when I arrive?
Please speak to the receptionist. They will check your details and may ask you to complete a form with details of your medical history, and contact details of your next of kin and the person collecting you.
We ask your family and friends not to come with you beyond this point. The department can be very busy and space is limited. We will tell them the approximate time that you will be ready. The recovery staff will call them with a time they can collect you.
The nurse will take you to an admission room to complete the paperwork, check your blood pressure, pulse, and oxygen levels to make sure you are well enough to have the procedure. If you have diabetes the nurse may also test your blood glucose level.
If you decide to have sedation, a cannula (flexible needle) will be inserted into a vein in the back of your hand or arm so that the intravenous sedation can be given.
The nurse will discuss the risks and benefits of having the procedure to make sure you understand what the procedure involves. You will be asked to sign the consent form. You will be able to ask questions at this point.
Will I have sedation?
OGD can be slightly uncomfortable but not painful. Many patients do not require sedation as a local anaesthetic is sprayed to make the back of your throat numb. This makes it easier for the endoscope to pass down. This also means you can leave the unit shortly after the examination and carry on as normal.
If you choose to have sedation, a cannula will be inserted in a vein in the back of your hand or arm. The sedation will make you drowsy but not unconscious. You will still hear what is being said to you. It is not a general anaesthetic. You will need to arrange for someone to collect you from the unit and stay with you for at least 6 hours.
Your reaction times will be slower and your judgement affected so you will not be able to drive, operate heavy machinery, sign any legally binding documents, or look after small children or vulnerable adults for 24 hours.
OGD with throat spray
If you have the procedure with throat spray alone, you may leave the department once the discharge paperwork has been handed over to you. There are no restrictions apart from not eating or drinking for 1 hour after having the throat spray.
Once 1 hour has passed you are able to test your swallowing with sips of water at room temperature, after which you are able to eat and drink as normal. You will be awake during the procedure.
Can my relative/friend stay with me?
There is limited space within the department so unfortunately this is not possible. We will advise them of an approximate time for you to be collected.
Will I be in a mixed ward?
There are separate male/female waiting and recovery areas.
Who will be in the procedure room with me?
- A nurse who will monitor and support you.
- The endoscopist who will do the procedure.
- Another nurse who will assist the endoscopist.
The procedure will be done by a consultant or a non-medical/ clinical endoscopist. In some cases, an endoscopist who is doing further training (a qualified professional) may also be there. They will be learning to perform endoscopy under direct, expert supervision.
If you would prefer not to have your OGD done by someone training, you can tell us before coming into the procedure room.
Student nurses may also be there and be supervised by the training nursing staff.
What can I expect during the procedure?
When you enter the room, you will be introduced to the team. A checklist will be completed and you will be asked to confirm your details. This is standard procedure to ensure your safety.
You will be made comfortable on a trolley and any monitoring equipment attached. The nurse looking after you will be at your head throughout.
The endoscopist will spray the back of your throat. You will lie on your left-hand side and a mouth guard be placed between your teeth. The nurse looking after you will be at your head throughout.
If you are having sedation this will be given through the cannula in the back of your hand or arm. Once you are relaxed the procedure will begin.
When the endoscopist passes the endoscope over the back of your tongue, or through your nose, it is important to stay calm. It may make you gag, but this feeling will go away. It should not cause you any pain or stop you being able to breathe through your nose and mouth. The nurse will suction/wipe any secretions away to keep your airway clear.
As the endoscope slides down the oesophagus into the stomach. Air will be passed through to ensure a clear view of the lining. This may make you feel bloated, but it will pass.
You may feel a bit of pressure as the endoscopist passes the endoscope through the stomach. This should not be painful.
The duodenum will be checked and then the endoscopist begins to remove the endoscope. They take photographs and possibly biopsies for analysis on the way back, this is painless.
Is OGD painful?
It is normal to feel some discomfort during the procedure due to air being introduced into the stomach. You may have a sore throat afterwards, but this will pass.
What happens after the procedure?
If you have had throat spray only, you will be discharged shortly after the procedure with your discharge paperwork saying the time you can drink/eat from.
If you have had sedation, you will be taken into the recovery area for monitoring. When you have recovered from the initial effects of the sedation the staff will contact your relative/friend to tell them when you will be ready to go home.
You will be given written discharge advice and your cannula will be removed.
When do I find out the results?
Before you leave the department the results of will be explained to you together with any further tests that may be required.
Biopsies usually take at least 4 weeks to be processed, sometimes longer. You will be told the results by letter or at an outpatient appointment.
How will I feel after the OGD?
Your throat may feel a bit sore. It will settle without treatment, but simple pain medication like paracetamol may help.
You may feel bloated due to air still in your stomach but this should soon settle.
What should I do when I get home?
If you have had throat spray you can return to your normal day as soon as you feel able.
If you have had sedation, rest quietly for the rest of the day. You will be able to return to normal activities after 24 hours.
You will be given detailed discharge advice before you leave the unit.
What if I feel unwell or have any concerns after I have been discharged?
If you have any of the following please contact your GP, NHS 111, or go to the Emergency Department and take your results with you:
- a fever
- passing a lot of blood from your bottom or black stools (poo)
- severe abdominal (tummy) pain
- severe bloating or vomiting
A copy of your results is sent to your GP. You will also be given a copy in case you need to seek medical advice before your GP receives their copy.
If you have any concerns about your test please contact the helpline. Leave your name, number and a short message: 0117 414 5077.
Date published: 25 March 2026 Review due: 31 March 2029 PI number: BFT002823