We've just got a paper accepted in Nuklearmedizin which describes a better way of determining TSH reference ranges. What it does is minimise the uncertainties at each end of the range for assessing cutoff points. This may be technical for Healthunlocked, but it does at least challenge conventional ways of deriving ranges and for this forum, the range seems to be around 0.5-3.5. You could use this to challenge higher ranges and diagnosis from them.
Last edited by Clutter