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Euthyroid hyperthyroxinemia is defined as a condition in which the serum total thyroxine (T4) and triiodothyronine (T3) concentrations are increased, but the thyroid-stimulating hormone (TSH) concentration is normal and there are no clinical signs or symptoms of thyroid dysfunction. These changes may be transient or persistent.
Trends in Endocrinology and Metabolism, 22, 164-170. https://doi.org/10.1016/j.tem.2011.02.002 [22] Jin, H.Y. (2016) Thyroxine Binding Globulin Excess Detected by Neonatal Screening. Annals of Pediatr