This is something that I have been wondering more and more about lately, especially since living in a system where you have a doctor for every ailment...meaning you could easily be sent to the lab five or six times a year to have the same tests, depending on which doctor ordered them
I know most doctors freak out at the sight of a suppressed (<0.01) TSH. I used to think I could go off NDT and back on T4 only long enough to make my TSH return to normal...not so. I think my TSH has been suppressed for so long that it's not just going to bounce back to "normal" (= anything above 0.1 or 0.2 and below 4.0 or 4.5 or whatever the lower normal range of the lab).
I feel so good on NDT that there is no way I'd be willing to go off it even temporarily...so, since I imagine there any others like me out there, that is, doing well only on TSH suppressive doses of either NDT or T3 or any combination thereof, what do you tell your GP when s/he freaks out about your suppressed TSH...???