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Congenital hypothyroidism (CH) is an endocrine disorder of newborns characterized by the decreased levels of thyroid hormones: thyroxine (T4) and triiodothyronine (T3) in periferal blood. In early perinatal period manifestations of CH are often non-specific, subtle or even non-existent [1-2]. However, the disease, if undiagnosed and untreated, leads to severe