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PLoS By Category | Recent PLoS Articles
Diabetes and Endocrinology - Pediatrics and Child Health - Public Health and Epidemiology

Neonatal Thyroid-Stimulating Hormone Concentrations in Belgium: A Useful Indicator for Detecting Mild Iodine Deficiency?
Published: Wednesday, October 24, 2012
Author: Stefanie Vandevijvere et al.

by Stefanie Vandevijvere, Wim Coucke, Jean Vanderpas, Caroline Trumpff, Maarten Fauvart, Ann Meulemans, Sandrine Marie, Marie-Françoise Vincent, Roland Schoos, François Boemer, Timothy Vanwynsberghe, Eddy Philips, François Eyskens, Brigitte Wuyts, Valbona Selimaj, Bart Van Overmeire, Christine Kirkpatrick, Herman Van Oyen, Rodrigo Moreno-Reyes

It has been proposed that neonatal thyroid-stimulating hormone (TSH) concentrations are a good indicator of iodine deficiency in the population. A frequency of neonatal TSH concentrations above 5 mU/L below 3% has been proposed as the threshold indicating iodine sufficiency. The objective of the present study was to evaluate feasibility and usefulness of nation-wide neonatal TSH concentration screening results to assess iodine status in Belgium. All newborns born in Belgium during the period 2009–2011 (n?=?377713) were included in the study, except those suffering from congenital hypothyroidism and premature neonates. The frequency of neonatal TSH concentrations above 5 mU/L from 2009 to 2011 in Belgium fluctuated between 2.6 and 3.3% in the centres using the same TSH assay. There was a significant inverse association between neonatal TSH level and birth weight. The longer the duration between birth and screening, the lower the TSH level. Neonatal TSH levels were significantly lower in winter than in spring or autumn and significantly lower in spring and summer than in autumn while significantly higher in spring compared to summer. In conclusion, despite that pregnant women in Belgium are mildly iodine deficient, the frequency of neonatal TSH concentrations above 5 mU/L was very low, suggesting that the neonatal TSH threshold proposed for detecting iodine deficiency needs to be re-evaluated. Although neonatal TSH is useful to detect severe iodine deficiency, it should not be recommended presently for the evaluation of iodine status in mildly iodine deficient regions.
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