This new blog discusses the changing relationship of pituitary and thyroid hormones with age. It also notes that, to cover more patients as "within range ie euthyroid" by combining TSH from two different methods has led the Alberta health group in Canada to widen the range for TSH up to 6.5. This is strictly forbidden as each TSH test has its own distortions and dissimilarities somewhere in the ranges.
Age bias may hide hypothyroidism under a normal TSH
BY THYROIDPATIENTSCA on JULY 22, 2022 • ( 0 )
Written by
diogenes
Remembering
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Since many doctors now consider a TSH of 10 to indicate "mild hypothyroidism", what results for Free T4 and Free T3 would a doctor expect to see with a TSH of 10 (if they ever actually tested them)?
Yes, that's what I thought. I've seen people giving results for Free T4 and Free T3 that were similar to mine when I was first diagnosed as having subclinical hypothyroidism. The TSH quoted in one case was around 10, another person had a TSH of around 30. Mine never reached 6.
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High antibodies for years but on no treatment
On the Clinical Diagnosis and Treatment of Hypothyroidism
I'd like some advice on my levothyroxine treatment. 
