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What blood in stool means and red flags for medical evaluation Gastrointestinal disease Basicmedical Key Melena: What Is It, Causes, Symptoms, Bleeding, Treatment, and More Osmosis 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
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