Colorectal cancer screening at home. Looks for blood in the stool, which could be a sign of colon cancer or other harmless digestive tract issues like hemorrhoids. The colon or the rectum is where colorectal cancer begins. Colorectal cancer is the third most prevalent cancer diagnosed in both men and women in America, after skin cancers and lung cancers. When discovered early, colon cancer is actually treatable and curable. This Fecal Immunochemical Test (FIT) for colorectal cancer detection assists in determining the presence of malignant and/or precancerous growths in your colon by finding traces of blood (hemoglobin) in your stool in the comfort of your own home. Doctors advise repeating FIT testing every year.