Stool Poop Color What it may mean Brown: In GrepMed indications* for ordering a fecal occult blood test (FObT) Download Table Gastrointestinal Disease in Mastocytosis Immunology and Allergy Clinics 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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