Fecal occult blood is small amounts of blood hidden in the feces, notes Mayo Clinic. Tests for fecal blood are done to see if there is blood loss in the gastrointestinal tract, which stretches from the mouth to the colon... More » Health Diagnostics & Imaging

Fecal occult blood test results determine whether or not a patient has a problem in his digestive system, such as a polyp, growth or cancer in the rectum or colon, according to WebMD. The doctor carries out a fecal occul... More » Health Diagnostics & Imaging

Occult blood in stool is impossible to see with the naked eye and requires a fecal occult test that detects hidden blood in feces sample, according to WebMD. Sometimes people can see blood in their stool, however. More » Health Conditions & Diseases
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