In preparation for Fecal Occult Blood Testing (FOBT), the nurse will teach the patient to refrain from eating red meat 3 days before the test, to avoid taking more than 250 mg of vitamin C 2-3 days before testing, as well as abstain from consuming citrus fruits or juices for 3 days before the test. The patient must also stay away from Nonsteroidal Anti-inflammatory drugs (NSAIDs) 7 days before the stool sample is collected.