FT3I = free triiodothyronine index; FT4I = free thyroxine index; RTU= resin uptake; TSH = thyroid stimulating hormone; TSI = thyroid stimulating immunoglobulins; TT3 = total triiodothyronine ...
[7] Concentrations of both total thyroxine (TT4, or L-thyroxine) and total triiodothyronine (TT3) hormones increase in early pregnancy as the result of an increased liver secretion of thyroxine ...