In fact, having small traces of blood in the stool is normal. Fecal blood in amounts greater than normal, but not noticeable visually, is called occult blood. The test detects digestive tract bleeding in the stool and is used to screen for colon and rectal cancer.
Colon cancer is a major cause of death in the United States.
Regular testing can therefore be a life-saving routine. Healthcare providers recommend regular, occult blood tests starting at age 50. Before the test, the patient should eat a high fiber diet for 2 or 3 days. He or she should avoid certain raw foods, turnips, horseradish, and also red meat. Testing may take place in a lab or clinic.