Having an upper endoscopy is a safe procedure that can be performed as an outpatient endoscopy facility in most cases. You will be asked to not eat or drink anything for 4 hours before the test. After you brought back to the procedure room, you will be asked to lie on your left side. A protective guard will be placed to protect your teeth. Then the anesthesia specialist will give you an intravenous medication to be sure you are asleep and comfortable during the procedure. The specialist will insert a small flexible fiberoptic video scope and carefully advance it to visualize the esophagus, stomach, and duodenum. If inflammation or any abnormality is identified, small samples of tissue, biopsies, may be obtained. Sometimes narrowing of the esophagus, a stricture, may be enlarged with special instruments. The procedure usually takes 10-20 minutes.