Is there anything else I should know?
False positives can occur with FOBT. Depending on the method used, you may need to avoid: 1) substances or conditions that cause bleeding, such as bleeding gums following a dental procedure or drugs that may cause gastrointestinal bleeding, such as anticoagulants, aspirin, steroids, and large doses of iron preparations; 2) other sources of hemoglobin, such as the ingestion of red meat within three days before testing; and 3) other substances, such as fish, turnips, horseradish, or drugs such as colchicines and oxidizing drugs (for example, iodine and boric acid). Your doctor may have you stay off your medications and follow dietary restrictions before collecting the FOBT samples.

False negatives may be caused by large doses of vitamin C and by not collecting multiple samples (because cancers and precancerous polyps produce blood intermittently).

참고 링크:
http://labtestsonline.org/understanding/analytes/fecal_occult_blood/test.html
http://www.nlm.nih.gov/medlineplus/ency/article/007008.htm
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