Fecal occult blood testing (FOBT) checks stool samples for hidden (occult) blood loss from the mouth to the colon. A positive result indicates either upper gastrointestinal bleeding or lower gastrointestinal bleeding. The test does not directly detect colon cancer but is often used in clinical screening for that disease. It can also be used in early diagnosis of active occult blood loss in anemia or other gastrointestinal symptoms.
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