Evaluation of the Guaiac Positive Patient



One of the more common encounters a physician must deal with is the presence of occult gastrointestinal blood loss. The prevalence may reach up to 1 in 20 adults. The detection of occult blood is important because a person may lose up to 150 ml of blood from the proximal gastrointestinal tract before producing overt melena [1]. Before proceeding further, an important distinction must be made between occult gastrointestinal blood loss and obscure gastrointestinal bleeding.


Celiac Disease Fecal Occult Blood Test Fecal Occult Blood Hereditary Hemorrhagic Telangiectasia Positive Fecal Occult Blood Test 
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© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Division of GastroenterologyDuke University Medical CenterDurhamUSA
  2. 2.Department of Medicine Division of GastroenterologyDuke University Medical CenterDurhamUSA

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