Gastroscopy: All you need to know

Written by: Dr Michael Glynn
Published: | Updated: 24/05/2023
Edited by: Jay Staniland

In this article, Dr Michael Glynn, leading Consultant Gastroenterologist, provides an expert insight into a gastroscopy procedure, including what is it, what is it for, and how long does it take.



Gastroscopy procedure: what is it?


A gastroscopy is a procedure where an endoscope is used to see the inside of the oesophagus (gullet), the stomach and the small intestine (duodenum). The endoscope is a thin, flexible tube that allows the doctor to see inside the patient with the use of a light and a light-sensitive chip, with the image displayed on a screen.


Gastroscopy procedure: what is it for?


The gastroscopy procedure is a kind of endoscopic procedure, which includes an examination of the oesophagus (gullet), stomach and the upper part of the duodenum (the very first part of the small bowel).

The procedure is extremely useful for the evaluation of dyspepsia, heartburn and vomiting. It enables the doctor to visualise, and biopsy ulcers and areas of inflammation.

If there is cancer present in the stomach or the oesophagus, it can be seen and biopsied during the gastroscopy procedure. Samples can also be taken to test for helicobacter infection.

The procedure also allows the doctor to see rarer problems such as the presence of dilated gullet veins in patients with cirrhosis.

Read more: what does gastroscopy look for?


Gastroscopy procedure: how long does it take?


The gastroscopy procedure usually takes between 5 and 10 minutes, and rarely lasts any longer.

Most patients find it acceptable to be wide awake, with a local anaesthetic spray on the throat, which makes the process quick and simple.

If the patient does not feel they can cope with this, the procedure can be done under a sedative injection which requires longer recovery and the rest of the day off work. Full general anaesthetic is rarely needed.

 A gastroscopy is a very safe procedure, with an extremely low risk of complications.


If you have concerns about any of the conditions mentioned, do not hesitate to contact your doctor or a gastroenterologist specialist such as Dr Michael Glynn.

By Dr Michael Glynn

Dr Michael Glynn is a highly experienced consultant gastroenterologist/hepatologist based in London. He specialises in gastroenterology, acid reflux, liver diseasehepatology, gastroscopyGI endoscopyclinical nutrition, cirrhosis, performing colonoscopies, and abdominal pain. His private practice is based at BMI London Independent Hospital.

Dr Glynn, who successfully completed a MB BChir (1977), an MA (1978), and an MD (1995) at Cambridge University, has conducted an extensive amount of research in relation to protein metabolism in patients on intravenous feeding. He has held a number of high profile positions within his field, including being National Clinical Director for GI and Liver Diseases within NHS England. Alongside his practice, Dr Glynn is in demand as a medico-legal expert within the fields of general medicine,gastroenterology and hepatology and is dedicated to medical education, serving as Honorary Senior Lecturer at Queen Mary University of London. Dr Glynn has co-edited Hutchinson's Clinical Methods, the oldest continuously published general medical textbook, through a number of editions.

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