Would these be the best scans to do once every few years just to make sure? What about just regular chest x-rays? Would blood tests even show abnormalities? Since many cancers are asymptomatic especially in otherwise young/healthy people, and I want to be 100% sure I'm okay, and if there's something wrong to detect it in its earliest stages, what tests would be the most beneficial? Would a FULL BODY CAT or CT scan do the trick? From what I've heard, they're VERY expensive and dangerous radiation wise, but VERY effective. I have excellent health insurance, so with that into consideration as well, would this be my best bet?