loading...| Preferred Name | Melena | |
| Synonyms |
Black feces Black faeces |
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| Definitions |
The passage of blackish, tarry feces associated with gastrointestinal hemorrhage. Melena occurs if the blood remains in the colon long enough for it to be broken down by colonic bacteria. One degradation product, hematin, imbues the stool with a blackish color. Thus, melena generally occurs with bleeding from the upper gastrointestinal tract (e.g., stomach ulcers or duodenal ulcers), since the blood usually remains in the gut for a longer period of time than with lower gastrointestinal bleeding. |
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| ID |
http://purl.obolibrary.org/obo/HP_0002249 |
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| alternative label |
Black feces Black faeces |
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| has narrow synonym |
Black feces Black faeces |
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| hasDbXref |
MSH:D008551 SNOMEDCT_US:35064005 SNOMEDCT_US:249627005 UMLS:C0474585 SNOMEDCT_US:267055007 UMLS:C0025222 SNOMEDCT_US:269899009 SNOMEDCT_US:2901004 |
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| imported from | ||
| label |
Melena |
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| prefixIRI |
HP:0002249 |
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| prefLabel |
Melena |
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| textual definition |
The passage of blackish, tarry feces associated with gastrointestinal hemorrhage. Melena occurs if the blood remains in the colon long enough for it to be broken down by colonic bacteria. One degradation product, hematin, imbues the stool with a blackish color. Thus, melena generally occurs with bleeding from the upper gastrointestinal tract (e.g., stomach ulcers or duodenal ulcers), since the blood usually remains in the gut for a longer period of time than with lower gastrointestinal bleeding. |
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| subClassOf |