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Neonatal blood TSH concentration in Wales (UK): an indicator of iodine sufficiency

Population iodine status can be assessed by urinary iodine concentrations, prevalence of goitre, frequency of newborn thyroid‐stimulating hormone (TSH) >5 mU/l and blood thyroglobulin concentrations. The UK population has historically been considered to be iodine sufficient; however, a recent survey of UK schoolgirls has demonstrated median urinary iodine concentrations consistent with mild iodine deficiency. The aim of our study was to assess the prevalence of TSH >5 mU/l in the newborn blood spot screening samples from the eligible population in Wales between 2011 and 2013 to assess iodine sufficiency.