I just go with my own feelings. If I feel like I need to "get things checked out", I just ask for a referral to have a CT scan. DEMAND if you have to or go to another doctor. Your GP can also give you a referral and send the results to the oncologist!!!!!. I have not had an ultrasound or mammogram since my Dec 2010 diagnosis. I suppose with all the treatment, my body should be okay. I did have a CT body scan a few months ago (can't remember why). Anyway I will have an ultraosound and mammo before I see the specialist surgeon (he is my primary carer) in June. I get to see the medical oncologist every 6 months as well so really I am having checks every 3 months. It gives me an opportunity to ASK in two avenues if I feel something is wrong. Just because you are small don't let them tell you what you need. XLeonie