###Human: Is there any simple test available to rule out colon or rectal cancer? ###Assistant: Hi. First of all, you get an MRI (magnetic resonance imaging) abdomen done. You can have a presence of mass when you have a colon or rectal cancer. If there is a mass seen, then you can do a colonoscopy. You can also do a CEA (carcinoembryonic antigen) as CEA show an increase in range when you have colon cancer. You can also do a stool DNA test. If the stool DNA test is positive, then you can also do a colonoscopy to confirm the diagnosis.