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| | Fecal Occult Blood Test (FOBT) |
 | | Blood in the stool may be caused by hemorrhoids, anal fissure, colon polyps, colorectal cancer, and many other conditions that cause bleeding in the gastrointestinal tract. |
 | | Blood in your stool may be caused by red meat you have eaten, menstrual bleeding, hemorrhoids, Crohn's disease, ulcerative colitis, a stomach ulcer, or the use of aspirin or nonsteroidal anti-inflammatory drugs (NSAIDs). |
 | | Blood in the urine, menstrual bleeding, hemorrhoids, an anal fissure, bleeding gums, nosebleeds, or eating certain vegetables (radishes, turnips or beets) or red meat cooked rare within 2 days before the test, which can cause a false-positive test result. |
| my.webmd.com /hw/colorectal_cancer/hw227116.asp (2378 words) |
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