An abnormal FIT result simply means that blood was found in the stool sample that you submitted. FIT can only tell us that you may be bleeding from somewhere in your lower digestive tract. It cannot tell us from which part or why.
FIT is a screening test that can only detect blood in the stool. FIT is not a diagnostic test. This means that while FIT can find one sign that may indicate cancer (blood in the stool), it cannot be used to diagnose cancer. Furthermore, the level of blood present in your stool cannot be used to diagnose any conditions. A higher level of blood does NOT mean that you have cancer.
There may be a number of different reasons why blood was found in your stool, including hemorrhoids (sometimes painless or internal), ulcers, anal fissures, diverticular disease, or inflammation. If you have an abnormal FIT result, it is important that you attend all follow-up appointments to find out why the result was abnormal.