In my case, I haven't for years. I've been avoiding the "doc".

I was particularly annoyed when I found out from my dad that the colon flush they had him use before colonoscopies was found to be a carcinogen, so they switched him to a different one. I just did a quick search, and the first page is nothing but medical clinics and reasons why you should get a colonoscopy. Personally, I think ivermectin removes any real value of it.