Hello. Not sure what you mean by "critical time" but I have mammograms in June and MRI's in Dec. I also see someone (oncologist, surgeon, rad. oncologist, primary care) every 3 months. I have full blood chemistries every 6 months (including calcium, liver and kidney). I don't not do "cancer type" tumor marker tests. I honestly could not handle that on the reg. I work two jobs (yes, even at 74) and so far all this has worked. I am unhappy when I hear that people have to beg for follow-up imaging. What I have seen is that this is often tied into whether or not someone is eligible for medicare. I also have 100% coverage medicare supplemental insurance. Regardless of the reason, it doesn't seem fair to me. I am glad you insisted!