Abstract
Background and Objectives: Subclinical hypothyroidism in pregnancy has been inconsistently associated with an increased risk of developing gestational diabetes mellitus (GDM). Materials and Methods: We retrospectively examined whether an antenatal thyroid stimulating hormone (TSH) level ≥2.5 mIU/L was associated with increased risk of GDM in 1147 pregnant women residing in a multi-ethnic suburban area of Sydney, Australia. Results: Despite a high prevalence of GDM and hypothyroidism in our study, women with antenatal TSH concentrations ≥2.5 mIU/L were not at increased risk for development of gestational diabetes. Traditional risk factors for GDM, such as maternal body mass index, ethnicity, previous GDM pregnancy and family history of type 2 diabetes were significant predictors of incident GDM on multivariable analyses. Conclusion: Mild elevations in antenatal TSH concentration did not significantly increase risk of incident GDM compared to healthy euthyroid women.
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