Levothyroxine

Levothyroxine-Induced Mild TSH Suppression Elevates Reverse T3 without Altering fT3 in Euthyroid Papillary Thyroid Microcarcinoma Patients on Active Surveillance

Levothyroxine therapy lowering TSH in euthyroid PTMC patients during active surveillance raises reverse T3 levels while maintaining stable free T3, suggesting altered thyroid hormone metabolism and a compensatory adaptive response.