I understand your concern.
The first question is what is your past hisotry of colonoscopies? Have you had precancerous polyps in the past? If so, then fecal tests are not recommended
Why is your PCP recommending a colonoscopy for you?
At 82 I was due for a five year followup colonoscopy (I have history of polyps). Since I now have lung cancer and breathing issues, I was concerned about anesthesia and wondered if I really needed to do it given my age and issues. And my local primary care doctor was not the right person to confirm if I was healthy enough.
I decided to do a consult at Mayo Clinic since I am a patient there. The MD (not PA or NP) I saw reviewed my previous colonoscopies and noted that I had had pre-cancerous polyps in the past and in fact one they had mislabelled. He recommended I do the colonoscopy in the hospital, my Pulmonologist said Monitored anesthesia care (MAC) was OK and I went through with it. They found 1 small and 2 large polyps all precancerous. I am due back in 3 years.
Be sure your preliminary interview is with an MD specialist who reviews your history and not someone with lesser training who does not have the expertise to make a judgement call.