CCTV, I had Stage IIIB Colon cancer in Jan. 2009 and never had a positive FOB test. On the other hand, my husband has positive tests almost ever time he's tested and he's never had colon cancer.
I have external 'roids that will crack and bleed.
NOTE: I'm alive and well 5 years 5 months after dx even tho I did have a spot on my liver 2 years ago that had to be removed. I'm now 63.