The provider examines a portion of the small intestine for abnormalities using an endoscope, a tubular instrument with a light source and camera, which he inserts through the mouth. He includes the first and second parts of the duodenum and into the jejunum, but he excludes the ileum, the terminal portion of the small intestine, to look for a cause for gastrointestinal symptom such as bleeding and diarrhea. He takes samples of any suspicious tissue by brushing or washing the area to collect cells for laboratory analysis.
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