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So I've been looking into this for a while and got dissatisfied with the research. I had some questions - how long has it actually been falling and do levels differ around the world? (this could tell us what is causing the drop) I found an incredible lack of published research into those...

Thanks for the info. I've heard somewhere that they have moved the "normal" for TSH, much like they did with Test.

22% not too bad :)