Serum total thyroxine

3,5,3 ′, 5 ′ tetraiodothyronine, or thyroxine (Tyroxine, T4), is a hormone secreted by the thyroid gland. The main source. Under normal circumstances, T4 mainly binds to thyroid hormone binding globulin (TBG). The TT4 assay is one of the basic in vitro experiments for thyroid function status.

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