EndoscopyBy Mayo Clinic staff
Original Article: http://www.mayoclinic.com/health/medical/IM04428
An endoscopy procedure involves inserting a long, flexible tube (endoscope) down your throat and into your esophagus. This test is usually done under sedation. A tiny camera on the end of the endoscope lets your doctor examine your esophagus, stomach and the beginning of your small intestine (duodenum). A small tissue sample (biopsy) is usually taken for analysis.