Fecal Occult Blood Test (FIT)
The fecal immunochemical test, or FIT, detects hidden (occult) human blood in stool that isn't visible to the eye. It specifically recognizes hemoglobin from the lower digestive tract.
FIT is a widely used screening tool for colorectal cancer and can also flag polyps or other sources of bleeding. Because it's non-invasive and done at home, it's often a first step before deciding whether a colonoscopy is needed.
A positive result means blood was detected, which can come from colorectal polyps or cancer, hemorrhoids, or other bleeding in the digestive tract. A positive FIT does not diagnose cancer; it signals that follow-up evaluation, often a colonoscopy, is recommended.
A negative result means no significant blood was detected, which is reassuring, though it doesn't rule out all conditions and regular screening should continue on schedule.
The goal is a negative result. FIT is a qualitative test reported as positive or negative, and any positive result should be discussed with your clinician to plan next steps.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.