Colonoscopy images showing the presence of melanic stools in the cecum, Download Scientific Diagram 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 Black or Tarry Stools UF Health Melena Poop Smell Gastrointestinal disease Basicmedical Key GASTROINTESTINAL HEMORRHAGE (2): Melena. Melena, the passage of black, tarry stools, usually implies blood loss greater than 500 ml originating anywhere between the oropharynx and the right hemicolon. Melena occurs most often,
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