[credit_guy]

I did a colonoscopy last year, and it was covered by my insurance (in the US). I was referred by my primary care physician. My insurance is nothing special, it's the standard type of insurance people have access to when they get a corporate job.

The type of question "are colonoscopies worth it" is not actually people should ask themselves. This is a question your primary care physician should answer, and you should follow their advice. If you don't trust them, just go find another one.