Retroflexions.com The Rectal Bleeding Rainbow The Truth About Stool Color and Digestive Health 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, Retroflexions.com The Rectal Bleeding Rainbow
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