The synthesis of thyroid hormone, and its regulation, are complicated! If you've followed my Thyroid Thicket series, you have an overview of approaching someone who might be considered to have thyroid hormones.
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How do I get to GOOD?
Or, in other words, if my tests suggest something is amiss, what do I do? Let's just talk about hypothyroidism, which raises the possibility of replacing, by prescription, thyroid hormone. Hypothyroidism, whether overt or subclinical, takes a toll on normal physiology and will generally get worse if treatment is delayed. You have many options for treatment, starting with two special considerations: