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TSH Levels in Relation to Gestation, Birth Weight and Sex

Lookup NU author(s): Dr Srinivasa Korada, Professor Mark Pearce, Dr Stephen Turner, Dr Timothy Cheetham

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Abstract

Aims: Low birth weight is associated with hypothyroidism and an adverse metabolic profile in later life. Our aim was to examine the relationship between neonatal TSH and birth weight, gestational age and sex. Methods: We compared blood spot filter paper TSH levels with birth weight, gestational age and sex in a 10% sample of infants screened for congenital hypothyroidism at a single centre in Northern England. All gestational ages were included with infants suspected of having congenital hypothyroidism excluded. Results: Data on 1,728 male and 1,662 female infants were analysed. The distribution of TSH was significantly different between males and females, with males having a higher median TSH (0.7 vs. 0.6). Correlations were shown between TSH and birth weight (rho = -0.07, p = 0.0001) and gestational age (rho = -0.05, p = 0.008), with the birth weight association remaining independent of gestational age. The functional form of the model suggested that higher TSH in the lowest birth weight categories was responsible for the association between TSH and birth weight. Conclusions: Low birth weight is related to neonatal TSH levels. Further research is required to assess whether this association explains the relationship between higher TSH and an adverse metabolic profile in later life. Copyright (C) 2009 S. Karger AG, Basel


Publication metadata

Author(s): Korada SM, Pearce MS, Avis E, Turner S, Cheetham TD

Publication type: Article

Publication status: Published

Journal: Hormone Research

Year: 2009

Volume: 72

Issue: 2

Pages: 120-123

Print publication date: 01/08/2009

ISSN (print): 0301-0163

ISSN (electronic): 1423-0046

Publisher: S. Karger AG

URL: http://dx.doi.org/10.1159/000232165

DOI: 10.1159/000232165


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