Understanding Melena: What Does It Mean When You Have Dark Stools? Fortis Healthcare 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, What does your poop colour indicate? Pay attention. There's a lot to be learned by the colour and consistency of your stools, as well as the frequency and how easily passed Let's talk about your bowels Four Seasons Dietetics Two Islands Why are healthy bowel motions important? Blog