[shadowprofile77]

Just as I thought: A test that bases its effectiveness on occult fecal blood will obviously stumble around the very common phenomenon of hemorrhoids, and only a colonoscopy can clarify better. On the other hand, if no blood is detected, there still exists the possibility of polyps or tumor growth which have not recently or yet started to release blood, making this test more than a bit unreliable as a measure of something that could be life or death.