Weight Loss, Bariatric & Metabolic Surgery

Upper Gastrointestinal, Oesophageal & Stomach Surgery

Endoscopy / Gastroscopy & Colonoscopy

Keyhole and General Surgery

Cancer Screening Emergency and Acute Care Surgery

Endoscopy / Gastroscopy


What is an Endoscopy/Gastroscopy?

A gastroscopy, also known as Oesophago-gastro-duodenoscopy (OGD) is an endoscopic procedure that is performed to examine the oesophagus (gullet), stomach and the first part of your small intestine, the duodenum.

A thin flexible tube with a small light and video camera is inserted through the mouth, until it reaches the duodenum. It is connected to a screen that allows Dr Tan to evaluate any abnormalities seen along the way.

Dr Tan will also test for the presence of Helicobacter Pylori bacteria. If the results come back as positive, he will provide you with medication for treatment.

You will be given sedation just before the start of your gastroscopy.

What are the benefits of the procedure?

A gastroscopy is performed to examine the alimentary tract and diagnose conditions like stomach cancer, gastritis or peptic ulcers. Detection of stomach cancer in the early stage can be curable with better outcomes.

It may also be performed to treat conditions, such as bleeding ulcers, non-cancerous or cancerous growth or tumours.


When do I need to go for an Endoscopy/Gastroscopy?

If you have any of the below-mentioned symptoms, you can be recommended to go for an Endoscopy/Gastroscopy.

Symptoms to look out for:

The Procedure

What to expect during an endoscopy/ gastroscopy?

Before the Procedure

During the Procedure

After the Procedure

20+ Years of Clinical Expertise

Dr Tan Chun Hai (陈俊海医生)

Upper Gastrointestinal, Bariatric & General Surgeon

Dr. Tan Chun Hai is a dual fellowship-trained surgeon in laparoscopic (keyhole) stomach cancer surgery and bariatric & metabolic surgery. His clinical expertise includes the use of minimally invasive surgical techniques for gallbladder diseases, appendicitis and gastroesophageal reflux disease.

Dr. Tan is also well-versed in specialised diagnostic procedures, regularly carrying out endoscopy/gastroscopy and colonoscopy for his patients. When applicable, Dr. Tan provides same-day treatment within a few hours of diagnosis. Dr. Tan subscribes to a less invasive practice, enabling shorter hospital stays, usually within 1-2 days.

Have a concern?

Give us a call at 6250 5610 or contact us through the following enquiry form.


Frequently Asked Questions

  • Generally, a gastroscopy takes about 10-15 minutes. If there are polyps to be removed or abnormalities detected, it may take longer.
  • Any polyps seen will be removed immediately and sent to the laboratories.
  • Dr Tan will also check for any presence of Helicobacter pylori bacteria
  • A therapeutic gastroscopy may take longer as it may involve injection of medications, application of endoscopic clips, electrocautery to stop bleeding.application of endoscopic clips, electrocautery to stop bleeding.
Yes, we can schedule for gastroscopy and colonoscopy at the same visit.
Yes, Dr Tan will check if there is Helicobacter Pylori in the stomach. If there is presence of helicobacter pylori, Dr Tan will provide you with the necessary medications.

Helicobacter pylori (H. pylori) is a type of bacteria. It can cause ulcers in the stomach and duodenum. For some people, if infection with H. pylori is not detected or treated, this may lead to inflammation of your stomach lining (gastritis), stomach ulcers and possibly stomach cancer. Up to 80% of stomach cancer have been attributed to H. pylori infection.

H. pylori is one of the commonest long-term bacterial infections worldwide, affecting up to 50-70% in some parts of the world. In Singapore, it has been estimated that 31% of the population has been infected by H. pylori.

H. pylori can enter your body and live in your digestive tract for years before symptoms start. It attacks the lining of your stomach that usually protects you from the acid usesd to digest food. Once H. pylori have done enough damage, acid can get through the lining, which leads to stomach ulcers. Ulcers left untreated for a long period of time can eventually turn into stomach cancer.

A gastroscopy is usually performed as an outpatient procedure, which means you will not have to spend the night in the hospital. With sedation, you will be placed under close monitoring at the endoscopy centre. You will be discharged when it’s safe to do so.
  • Reaction to the sedation
  • Perforation of the oesophagus, stomach or duodenum happens in less than 0.01% of gastroscopy. The risk is lower if this is performed by a specialist skilled in gastroscopy.
  • Bleeding after polypectomies. Please inform Dr Tan if you are on blood thinners or anti-platelets medications. These are usually started if you had a stroke, heart attack or stent placed in your body. These medications are usually started by your GP, cardiologist or neurologist. Bleeding can occur immediately after the scope, or up to 10 days after the procedure.
  • Abdominal Bloating – this usually settles within a day or two after the endoscopy.
  • Sore throat
  • A Diagnostic Gastroscopy is performed to check for symptoms, biopsy any abnormalities, or confirm a diagnosis of oesophagus, stomach or duodenal cancer. It can also be used to check the presence of Helicobacter Pylori bacteria. If the results come back as positive, we will give give you antibiotics for treatment.
  • A Therapeutic Gastroscopy is used to treat a condition or disease related to the alimentary tract.
  • Most commonly it is used to stop bleeding ulcers in the stomach or duodenum. If there is any narrowing in the oesophagus, stomach, or duodenum, there can be options used to open up the narrowing using advanced endoscopic techniques.