Basal body temperature is the best thyroid test and can give you a lot of insight as to whether you are truly hypothyroid even
if other thyroid tests say you're not.
And an elevated TSH is often the only time
any other thyroid tests are run — and we'll get to why that's a big problem in a minute, first back to what's the best top end for TSH.
And as I've mentioned many times before, TSH tests, blood tests, and
all other thyroid tests DO NOT tell you how much thyroid hormone your cells are actually using, which is the only true way to accurately diagnose hypothyroidism.
I have not even bothered to check my iodine level nor my TSH nor
other thyroid tests.
When used in conjunction with
the other thyroid tests, this helps to give a complete picture of why the thyroid is underperforming.
My TPO was barely elevated (a 12 and test said < 9 was normal,
all other thyroid tests were normal).
The other thyroid test markers are Total T4 and Total T3 and Free T4 and Free T3 — All of these markers are hormones.