1. Volume 118, Issue 1, Pages 197-200 (January 2000)
American Gastroenterological Association medical position statement: Evaluation and management of occult and obscure gastrointestinal bleeding 
Gastroenterology 
Volume 118, Issue 1, Pages (January 2000)
DOI: /S (00)70429-X
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2. Fig. 1
Algorithm for evaluation of occult bleeding. *The indication and sequence of endoscopic procedures may be directed by patient age, symptoms, and comorbid conditions; small bowel biopsy is indicated at this juncture only in the presence of clinical or endoscopic evidence of celiac sprue. **Radiological studies may be indicated when comorbid conditions make endoscopy risky or when endoscopy is incomplete; small bowel follow-through radiographs have a very low yield unless clinical evidence exists for small bowel disease.
Gastroenterology  , DOI: ( /S (00)70429-X)
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3. Fig. 2
Algorithm for evaluation of obscure bleeding. *The decision to repeat upper endoscopy and/or colonoscopy may depend on the skill and expertise of the initial endoscopist; push enteroscopy can replace upper endoscopy at this juncture; and small bowel biopsy is indicated in patients with clinical or endoscopic evidence of celiac sprue or unexplained IDA. **Repeat routine endoscopy may be performed in actively bleeding patients at the discretion of the endoscopist. ***Push enteroscopy and/or Sonde enteroscopy may be performed, depending on operator and institution expertise; enteroclysis can complement enteroscopy and improve the diagnostic yield. #Angiography performed electively may demonstrate typical findings of angiodysplasia or a tumor blush.
Gastroenterology  , DOI: ( /S (00)70429-X)
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