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Stool Analysis: What It Detects Mediway The Quantity of Blood Required to Produce a Tarry Stool. How much? Melena, characterized by black tarry stools, can occur with as little as 50 cc of blood in the stomach. How Cancer of the Colon and Rectum Abdominal Key A preliminary study of further attempt at the development, testing and application of an independent primary screening stool card Scientific Reports
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