I believe I have previously seen information or a link that showed the 24 hour variation possible of either TSH or ft3. I would be grateful if anyone can point me in the right direction to find this info. Many thanks.
Query 24 hour variation of TSH : I believe I have... - Thyroid UK
Query 24 hour variation of TSH

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cjrsquared
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You could well have seen this post (or a reference to it):
TSH becomes irrelevent when at low levels.
I know that TSH is irrelevant at low levels and mine is kept suppressed due to thyroid ca. I am putting together some of the research that has been shared into a folder for my own information. I find the physiology and the biochemistry very interesting and you never know when you may need to produce some research when debating with some health professionals.