Abstract
Congenital hypothyroidism (CH) is a relatively common disorder with a prevalence of 1 in 2,500 live births [1]. CH is characterized by a significant deficiency of thyroid hormones starting in the perinatal period, which can lead to severe intellectual disabilities if left untreated but which was only recognized clinically at a median age of 9 months [2]. Therefore, biochemical screening for CH is now routinely performed at 2 days of life, enabling the initiation of thyroid hormone therapy during the second week of life, if required. The implementation, since the 1970s [3], of a universal newborn screening (NBS) for CH has prevented severe intellectual disability in numerous patients [4, 5]. This tremendous success might suggest that the “problem of CH has been solved” and that it now suffices to refine the screening procedure to “diagnose” all possible cases, even the most benign. This belief leads to the following misperceptions:
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Deladoëy, J., Van Vliet, G., Giguère, Y. (2015). Neonatal Screening for Congenital Hypothyroidism: What It Has Taught us About Thyroid and Brain Development. In: Bona, G., De Luca, F., Monzani, A. (eds) Thyroid Diseases in Childhood. Springer, Cham. https://doi.org/10.1007/978-3-319-19213-0_4
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DOI: https://doi.org/10.1007/978-3-319-19213-0_4
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