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Unit Code 8859:
T4 (Thyroxine), Free by Dialysis, Serum

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Method Description

The equilibrium dialysis method separates FT4 from serum proteins

and, thereby, also from protein-bound T4, before measuring it in the

protein-free dialysate using sensitive, tandem mass spectrometry.

The results are independent of the concentrations of the T4 binding

proteins and unaffected by the presence of molecular variants of

these proteins. (Soldin SJ, Soukhova N, Janicic N, et al:  The

measurement of free thyroxine by isotope dilution tandem mass

spectrometry. Clin Chim Acta 2005 Aug;358:113-118)

Performing Laboratory Location

Rochester

Key