HIGH TOTAL THYROXINE TEST RESULT REFERENT VALUES. What does high total thyroxine (FT4) test result referent values level mean?

Upper limit of normal total thyroxine (FT4) test result referent values is 12.3 (μg/dL) - 160 (nmol/l).

Total thyroxine (Total T4) is generally elevated in hyperthyroidism and decreased in hypothyroidism. It is usually slightly elevated in pregnancy secondary to increased levels of thyroid binding globulin (TBG).

Total T4 is measured to see the bound and unbound levels of T4 or where there could be protein abnormalities.