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Background Thyroid function is known to be closely linked with type 2 diabetes, but data on the association between thyroid function and gestational diabetes mellitus (GDM) are inconsistent. Methods A total of 2849 pregnant women were included in this retrospective study. Serum concentrations of thyroid indicators (free tetraiodothyronine, FT4; thyroid-stimulating hormone, TSH; and thyroid peroxidase antibody, TPO Ab) were obtained from a clinical laboratory. The presence of GDM were drawn from medical records. The clinical subtypes of thyroid function (euthyroidism, subclinical hypothyroidism, hyperthyroidism, and isolated hypothyroxinemia) were categorized according to the thresholds of the 2.5 th /97.5 th  and 10 th /90 th  percentiles of TSH and FT4 concentrations. A concentration of &gt; 34 IU/L was defined as indicating TPO Ab-positivity. Results Two hundred and thirty-five (8.25%) of the 2849 women were TPO Ab-positive. Higher serum concentrations of FT4 (top vs. bottom tertiles) was found to be negatively associated with the risk of GDM. The corresponding  odds  ( OR)  values (top tertile vs. bottom tertile) were 0.71 [ 95% confidence interval (CI) : 0.54, 0.93]. No significant associations were observed between the extremely 2.5 th /97.5 th  or 10 th /90 th  percentiles of FT4 concentration, TSH concentration, thyroid function subtypes (vs. euthyroidism), TPO Ab-positivity (vs. -negativity), and the GDM risk. The corresponding results remained similar when TPO Ab-positive subjects were excluded. Conclusions A negative association with the risk of GDM was observed for the highest FT4 concentrations tertile. No significant associations were found between the TSH concentration, thyroid function subtypes, TPO Ab positivity, and the GDM risk.

Associations between thyroid function and gestational diabetes mellitus in Chinese pregnant women: a retrospective cohort study