Biopsies of the GL tract.

Endoscopic biopsy for improved accuracy in upper gastrointestinal tract diagnosis. It permits thorough inspection and a direct biopsy yielding a tissue diagnosis of surface lesions from the upper part of the esophagus to the second portion of the duodenum. Upper endoscopy uses a thin scope with a light and camera at its tip to look inside of the upper digestive system -- the esophagus, stomach, and the first part of the small intestine, called the duodenum. During endoscopy, certain procedures such as taking a small tissue sample (biopsy) for testing may be performed.