Fecal occult blood

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What Wikipedia says

Fecal occult blood (FOB) refers to blood in the feces that is not visibly apparent (unlike other types of blood in stool such as melena or hematochezia). A fecal occult blood test (FOBT) checks for hidden (occult) blood in the stool (feces).

Excerpt from the Wikipedia article “Fecal occult blood”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Mikereichold 14:50, 11 November 2006 (UTC), CC BY-SA 2.5, via Wikimedia Commons.