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Home / Products / Free Thyroxine (fT4) (Blood)
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Thyroxine is the main hormone produced by the thyroid. Free T4 (fT4) measures the bioavailable level of T4 and is a good indicator of thyroid output by the thyroid gland.

Free Thyroxine (fT4) (Blood)Thyroxine is the main hormone produced by the thyroid. Free T4 (fT4) measures the bioavailable level of T4 and is a good indicator of thyroid output by the thyroid gland.