When is stool color concerning? 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, Stool changes healthdirect Black Stool Vs Dark Brown Retroflexions.com The Rectal Bleeding Rainbow
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