The Fecal Immunochemical Test, FIT, is the preferred test for Colorectal Cancer detection, receiving a grade of 1B by the American College of Gastroenterology. The ACG recommends a fecal immunochemical test annually beginning at age 50. Click here for the full ACG guidelines. The Second Generation FIT is easy, accurate, and profitable. Download the FIT test CPT code reimbursement guide here.