The frequency of these FT4 assay artifacts suggests that TSH or the TSH/FT4 relationship is a more reliable thyroid parameter to use than an estimate of FT4 alone. When it is suspected that a FT4 ...

Thyroid Hormone Binding Ratio (THBR ... a TT4 and/or TT3 measurement and used to produce free hormone estimates (FT4 or FT3 indexes). "Classic" T3-uptake or THBR tests are typically influenced ...

A study published in the Osteoarthritis and Cartilage found that higher concentrations of free thyroxine (FT4) were ...