Abbreviation: FOBT
A test used to detect the presence of blood in feces that is not visibly apparent. Used as a screening tool for colorectal carcinoma, but upper gastrointestinal bleeding (e.g., from a peptic ulcer) can also yield positive results. A positive result merits additional follow-up (e.g., upper endoscopy, colonoscopy). This test has poor sensitivity for detecting polyps.