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FT4 Plus
Thyroxine (T4) is a thyroid hormone which circulates bound to various proteins. Only 0.03 % of total serum thyroxine is not bound. This free thyroxine (FT4) is responsible for biological activity. Its concentration is nearly independent of the concentration of the binding proteins and thus it reflects the true thyroid status. The determination of free thyroxine is intended to be used as an aid in diagnosis of various thyroid disorders.
Assay format prevents from potential interference with biotin.
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FT4
Thyroxine (T4) is a thyroid hormone which circulates bound to various proteins. Only 0.03 % of total serum thyroxine is not bound. This free thyroxine (FT4) is responsible for biological activity. Its concentration is nearly independent of the concentration of the binding proteins and thus it reflects the true thyroid status. The determination of free thyroxine is intended to be used as an aid in diagnosis of various thyroid disorders.
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THYROID FUNCTION
Anti-hTg Anti-TPO Anti R-TSH FT3 FT4 FT4 Plus Thyroglobulin TSH TT3 TT4 T3 uptake Thyroid function - description of the function of thyroid gland in human body 
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FT3
Human triiodothyronine (T3) is a thyroid hormone which circulates bound to various proteins. Only 0.3 % of total serum triiodothyronine is not bound to proteins. This free triiodothyronine (FT3) is responsible for biological activity. Its concentration is independent of the concentration of the binding proteins and thus reflects the true thyroid status. The determination of free triiodothyronine is intended to be used as an aid in diagnosis of various thyroid disorders.