Melena, Causes, Signs and Symptoms, Diagnosis and Treatment YouTube Stool changes healthdirect 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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