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EGD (esophagogastroduodenoscopy or upper endoscopy) is an exam of the esophagus, stomach, and duodenum with and endoscope. 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). An endoscope is a long, narrow tube with a light and a video camera. The exam can be viewed on a video screen, and the preparation usually includes nothing to eat or drink after midnight the night before the exam.