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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.
What is an EGD? An EGD is a test that allows your doctor to look at your esophagus, stomach and duodenum (upper part of the small bowel). He or she would like to do an esophagogastroduo - denoscopy (EGD). This test is sometimes called an upper gastrointestinal (UGI) endoscopy. For this test your doctor will use a flexible lighted tube called an endoscope.