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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 Melena: What Is It, Causes, Symptoms, Bleeding, Treatment, and More Osmosis Hematochezia vs melena: Comparing symptoms, causes, and treatment What Does It Mean If My Poop Is Black? Melena Guide Gastrointestinal disease Basicmedical Key
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