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An FOBT is a simple chemical test that can detect blood in the stool, which may be a symptom of colorectal cancer. Patients can perform this test in the privacy of their own home by using a small stick from a test kit to apply to a test card a thin layer of stool from three consecutive bowel movements. After the samples have been collected, the patient sends the test card to the colorectal surgeon's office where it is checked for hidden blood. If blood is found, the colorectal surgeon will recommend a follow up colonoscopy.

Recommended testing: Beginning at age 50, all adults should have an FOBT once every year.