Esophagogastroduodenoscopy

In medicine (gastroenterology), esophagogastroduodenoscopy is a diagnostic endoscopic procedure that visualises the upper part of the gastrointestinal tract up to the duodenum. It is considered a minimally invasive procedure since it does not require an incision into one of the major body cavities and does not require any significant recovery after the procedure (unless sedation or anesthesia has been used). A sore throat is also common.
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An endoscope as used in the field of gastroenterology is a thin, flexible tube that uses a lens or miniature [more]Esophagogastroduodenoscopy - Community and Resources

Also known as EGD (for EsophagoGastroDuodenoscopy) or as upper endoscopy. A procedure that enables the examiner ( usually a gastroenterologist) to examine the esophagus (swallowing tube ), stomach, and duodenum (first portion of small bowel ) using a thin flexible tube (a "scope") that can be looked through or seen on a TV monitor. (A great crossword puzzle/trivia term!)