The provider performs a visual examination of the upper gastrointestinal tract using a lighted endoscope. He examines the entire upper digestive tract from the esophagus to the ileum. If he finds anything suspicious, he collects specimens by passing a brushlike device through the endoscope and brushing the mucosa or the lining of the digestive tract or by instilling warm water and suctioning it out through the endoscope. He sends the specimens to the pathology laboratory for histopathologic examination.
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