Anita.......The blood work being done is to look for cancer markers that identify if something is wacky in the body....cancer. I think. I forgot to mention that I also saw my RAD oncologist every quarter for about a year after i finished treatment. I was more than happy the day my oncologist gave me the six month check up routine. It put my life on a more even keel not having to worry about the CT scans ect. It felt like I'd just get over one CT scan, have a week or two without worry and then it was time again for the next quarterly scan. Three months goes by quickly; six months is a bit more doable in terms of anxiety and worry. Sincerely, Donna