Oesophago-gastro-duodenoscopy (OGD) is used by Gastroenterologists to examine the oesophagus, stomach and duodenum (the upper part of the small intestine). It is a simple procedure and can be done in the outpatient setting after a period of fasting. It involves placing a small tube through the patient’s mouth into the oesophagus, stomach and duodenum. This procedure can be used to diagnose certain conditions such as gastric/duodenal ulcers, oesophageal cancer, gastric cancer and inflammation of the upper gastrointestinal tract, as well as detect Helicobacter pylori. In addition, an OGD can be used to treat bleeding inside the upper gastrointestinal tract (endoscopic haemostasis).