The procedure you will be having is called an oesophago-gastro-duodenoscopy (OGD), sometimes known more simply as a gastroscopy, or endoscopy. What is an OGD? The proposed procedure you will be having is called an oesophago-gastroduodenoscopy (OGD) sometimes known more. What is a Gastroscopy? A Gastroscopy is an examination that will allow us to look directly at the lining of the oesophagus (the gullet), the stomach. What is an OGD? An OGD is an examination of your oesophagus. Oesophago-gastro-duodenoscopy (OGD) is an examination of the inside of the upper digestive tract by using a flexible video-endoscope which is passed.