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    T4 Free (Thyroxine)

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    My StoreT3, Free (Triiodothyronine)
    My StoreTestosterone, Free, Bioavailable and Total, MS
    This test is typically cross-referenced with TSH and T3 to gain insight into overall thyroid function. Thyroxine, or T4, is produced in the thyroid then released into the bloodstream where it travels to the liver and kidneys. It is converted to the hormone triiodothyronine (T3). The synergy of T4 and T3 is important for heart and digestive function, metabolism, brain development, bone health, and muscle control.

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