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Synonym (s): melaena. Blackening of the stools by altered blood that has been released into the bowel from bleeding in the OESOPHAGUS, STOMACH, or DUODENUM. Melaena implies loss of at least 60 ml of blood and is an important warning sign that should never be ignored.What does Melena mean?
Freebase(0.00 / 0 votes)Rate this definition: Melena. In medicine, melena or melæna refers to the black, "tarry" feces that are associated with gastrointestinal hemorrhage.What is the difference between Melena and hematochezia?
As nouns the difference between melena and hematochezia. is that melena is a passage of dark, tarry stools containing blood, as the result of upper gastrointestinal bleeding while hematochezia is (medicine) the presence of fresh blood in stools, often due to lower gastrointestinal bleeding.