Upper endoscopy lets your doctor examine the lining of the upper part of your gastrointestinal tract, which includes the esophagus, stomach and duodenum (the first portion of the small intestine). Your doctor will use a thin, flexible tube called an endoscope, and will view the images on a video monitor. When it comes to ensuring the health of your upper gastrointestinal tract, there's no one more skilled and trusted than Dr. Sonali Gautam, the best endoscopist in Navi Mumbai.