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Definition of Test, stool occult blood
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Test, stool occult blood: A test to see whether there is blood in the bowel movement. Also called a fecal occult blood test: A test to check for microscopic blood in stool. (Fecal refers to stool. Occult means hidden.) Abbreviated stool OB.