Feces
Fecal Occult Blood (FIT)
Also known as: FOBT, Hemoccult, Occult Blood Stool, iFOBT
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Reference ranges by source
Published adult intervals: 3, from 3 named sources, shown in µg/g.
About Fecal Occult Blood (FIT)
A fecal occult blood test (FOBT) checks for blood in a sample of your stool (poop). It's called occult (hidden) blood because you can't see it just by looking at it. And fecal means that it is in your stool.
Blood in your stool means there is bleeding in the digestive tract, which can be caused by a variety of conditions.
Colorectal cancer is one of the most common types of cancer in the United States. A fecal occult blood test can screen for colorectal cancer to help find the disease early, when treatment may be most effective.
Main source: MedlinePlus ↗
Useful for
A fecal occult blood test is commonly used as a screening test to help find colorectal cancer before you have symptoms.
The test may also be used to check for other conditions that can cause gastrointestinal (GI) bleeding.
Main source: MedlinePlus ↗
Interpretation
If your results from a fecal occult blood test show that you have blood in your stool, it means you likely have bleeding somewhere in your digestive tract. But that doesn't always mean you have cancer. Other conditions that may cause blood in your stool include ulcers, hemorrhoids, polyps, and benign (not cancer) tumors.
If you have blood in your stool, your provider will likely recommend more tests to figure out the exact location and cause of your bleeding. The most common follow-up test is a colonoscopy. If you have questions about your test results, talk with your provider.
For general wellness information only. Talk to a clinician about your specific results.
Main source: MedlinePlus ↗
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Related biomarkers
More tests in the feces category.
Sources
Last updated 2026-05-02
This page presents source-specific reference data and sourced explanations. For general wellness information only. This is not medical advice. For diagnosis or treatment of any condition, talk to a qualified clinician.