upper gastrointestinal (GI) endoscopy

A procedure that uses an endoscope (a thin, tube-like instrument with a light and lens) to examine or treat the esophagus, stomach and duodenum.

Doctors may remove cells or tissues to look at under a microscope. They may also use upper GI endoscopy to remove tumours.

Also called esophagogastroduodenoscopy (EGD) or gastroscopy.