I did the Colorguard also. Came back positive. Had a colonoscopy and found a benign polyp that had to be scraped because it was "flat" . Had another colonoscopy 6 months later to check on polyp again. Advised to have appendix removed because of location of polyp. Appendix removed. Polyp removed. Amen for now. Another colonoscopy in 12 months.
If I had to do it over again would just forget the Colorguard test and do colonoscopy. It just added to my stress.
Also to the cost. The colorguard test was $525.