I can't locate the note I sent, but I'm sure I mentioned the importance of checking free T3 and free T4, along with TSH. The free T3 is so important because it is the active component that largely regulates metabolism. If you happen to be one of those people who do not convert T4 to T3 very well, and you are on a T4 type med. such as Synthroid, then it's possible you can run a high T4 level, yet still feel hypo t if your free T3 is too low. If the doc only checks total T4 and total T3 you won't know all you need to know. Until you have test data that says you are converting your T4 med. well, the surest way to know your thyroid state is to always check free T3. Hypo t patients seems to do best when free T3 is in the upper third of its range.
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