fT4 (free thyroxine) – Probatix Health

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fT4 (free thyroxine)

fT4 is the precursor of the active hormone T3 and is predominantly produced by the thyroid gland. It circulates in the blood and can be converted into T3 in the organs to stimulate metabolism.

High fT4 levels typically indicate an overactive thyroid. Low levels, on the other hand, suggest an underactive thyroid.

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