Sorry to ask this question, I am sure it has been asked many times before, but I need some ammunition to confront my own doctor when I next go.
I saw another doctor in the surgery last week, which I don't usually do, as my doctor was away. I wanted another TSH test and possibly iron, as like so many others with a TSH of 4.57 (in February) I am still feeling awful. And... you know whats coming next, TSH in normal range, endo's and dr's take the view I am well medicated and symptoms are not taken into account.
So, my question is:-
I know that TSH is the pituitary's response to not enough hormone in the blood, but where is it getting its information from? T4 is a pre-hormone which is converted to the active T3 so will the pituitary know whether there is enough T4 in the tank, or will it go on the T3 alone.
Or... have I got it all completely wrong.
Thanks in advance