Fecal occult Blood Test

Fecal occult blood is a term for blood present in the feces that is not visibly apparent. In medicine, a fecal occult blood test is a check for hidden (occult) blood in the stool (feces). Conventional fecal occult blood tests look for heme. Newer, modern tests look for globin.
See more at Wikipedia.org...

A test to check for hidden blood in stool. (Fecal refers to stool. Occult means hidden.)

[FEE-kul o-KULT]
FOBT. A test to check for blood in the stool. Small samples of stool are placed on special cards and sent to a doctor or laboratory for testing. Blood in the stool may be a sign of colorectal cancer.