Labels:text | screenshot | black | black and white | font | document OCR: Fthe The results are usually related to a stan reference serum and are used as a ratio rence results of the unknown serum to the re le index serum for calculation of the free thyroxi ding tests (FTI) (Fig. 15.13). [Thyroid hormone bi erred to as are often incorrectly and misleadingly r measure 'T3 tests', They utilise 1251-T3 but are no asure of of total or free T3; they are an indirect m TA TB capacity and allow adjustment of tot concentrations in altered TBG status. See also: . Thyroid Hormone Transport