A member asked:

High t3 (liothyronine) and t4 thyroid results but no thyroid disorder. is this normal?

A doctor has provided 1 answer

Check free T4: The most common cause for having a high total T4 and T3 (liothyronine) level, with a normal tsh, is being on a birth control pill. Being on a birth control pill raises binding proteins that affect thyroid levels, but the biologically active thyroid level remains normal. This is best measured by a free T4 level.

Answered 1/15/2015



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