There are other screening methods that can test for colon cancer and precancerous polyps: Cologuard: A stool sample test for blood and genetic markers for cancer) Fecal immunochemical testing: A stool sample test for blood Fecal occult blood testing: A stool sample test for blood Sigmoidoscopy: Uses a flexible scope to view the lower third section of the colon Computed tomography (CT) colonography: Advanced X-ray imaging technology