The fecal occult blood test (FOBT) is a lab test used to check stool samples for hidden (occult) blood.

Occult blood in the stool may indicate colon cancer or polyps in the colon or rectum — though not all cancers or polyps bleed.

The fecal occult blood test is one option for colon cancer screening. It may be an option if you have an average risk of colon cancer and don’t have any symptoms. The fecal occult blood test is typically repeated yearly.

If blood is detected through a fecal occult blood test, additional tests may be needed to determine the source of the bleeding. The fecal occult blood test can only detect the presence or absence of blood — it can’t determine what’s causing the bleeding.

A fecal occult blood test isn’t recommended if you have colon cancer symptoms. If you notice blood in your stool or in the toilet or if you experience abdominal pain or a change in your bowel habits, make an appointment with your doctor.

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