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A Positive Newborn Screen for Congenital Hypothyroidism in a Clinically Euthyroid Neonate—Avoiding Unnecessary Treatment

Newborn screening for congenital hypothyroidism (CH) has dramatically improved the neurocognitive outcomes for newborns with a confirmed positive screening test result. However, screening yields a small number of false positive and false negative results. This report describes the first known case o...

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Detalles Bibliográficos
Autores principales: Brown, Ashleigh, Hofman, Paul, Li, Bobby, Heron, Campbell, Heather, Natasha
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10123723/
https://www.ncbi.nlm.nih.gov/pubmed/37092510
http://dx.doi.org/10.3390/ijns9020016
Descripción
Sumario:Newborn screening for congenital hypothyroidism (CH) has dramatically improved the neurocognitive outcomes for newborns with a confirmed positive screening test result. However, screening yields a small number of false positive and false negative results. This report describes the first known case of familial dysalbuminaemic hyperthyroxinaemia presenting with a positive newborn thyroid stimulating hormone screen. This condition is characterized by artefactually elevated free tetraiodothyronine (T4) and triiodothyronine (T3) levels due to increased albumin binding and subsequent dissociation during laboratory assays but normal true free thyroid hormone and thyroid stimulating hormone (TSH) levels in a clinically euthyroid subject. This highlights the need to take care when attributing clinical significance to discordant results.