i don't know anything about you or your medical history to tell you "your chances" that this blood is due to colon cancer but that is the reason this simple test is done. there are many reasons why this test would be positive other than cancer but when you have a positive test your medical provider will need to do a very careful diagnostic work-up to determine the source of the blood. it could be from your stomach your colon a hemorrhoid an anal fissure (tear) or from eating a lot of red (blood containing) meat. don't be alarmed but it is very important to get to the bottom (no pun intended) of this positive test.
i tested positive for blood in my stool. what are the chances that i have colon cancer?