Hi: this is just to report that we've had a new paper accepted and published online in Clinical Endocrinology 2014:
Homeostatic equilibria between free thyroid hormones and
pituitary thyrotropin are modulated by various influences
including age, body mass index and treatment
Rudolf Hoermann*, John E.M. Midgley†, Adrienne Giacobino*, Walter A. Eckl*, Hans G€unther Wahl‡,
What it proves is that there is no such thing as a TSH range that is suitable for everyone, and that the range is different according to the effect of independent influences such as age, body mass, size of working thyroid volume and whether someone is on T4 or not. The T4 therapy range is very much lower than the "normal" untreated and sits around the 1 or lower mark. The 3-4 upper level that works for the normal person is not satisfactory and can indicate undertreatment. Also we're finding that people with no thyroid working at all cannot easily regain normal FT3 with T4 alone and that TSH suppression often has to happen, and in some people no amount of T4 will regain normal FT3 levels. Recent reviews by the gurus now admit that some people cannot handle T4 only and regain health. Just thought you'd like to know that the avalanche is beginning.