Serum total T4 and fT4 levels were positively correlated with thyroxine dosage, while TSH-response to TRH stimulation was negatively correlated to it and serum T4 and fT4 levels as well.

• 作者认为血清T_4和fT_4测定对监测甲减患者服用T_4替代剂量比测定血清T_3更为重要。