Østrogener øger thyroxinbindende globulin (TBG), hvilket medfører en øget totalmængde thyreoideahormon målt ved protein- bundet jodid (PBI), T4 niveauer (ved kolonne - eller radio - immunanalyse) eller T3 niveauer (radio- immunanalyse).
Oestrogens increase thyroid binding globulin (TBG), leading to increased circulating total thyroid hormone, as measured by protein-bound iodine (PBI), T4 levels (by column or by radio- immunoassay) or T3 levels (by radio-immunoassay).