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Endoscopy is an examination using a tube-like device with a light on the end. A camera at the end of the tube transmits the lighted image before the tube to a TV screen so the the examiner can see the inside of the upper gastrointestinal tract as the tube advances.
Endoscopy is usually performed as an outpatient procedure. Endoscopy uses a thin tube, called an endoscope, with a light and camera at its tip to look inside the upper digestive system. It is passed down through the mouth into the oesophagus, stomach and the first part of the small intestine called the duodenum.