Lower iodine storage in the placenta is associated with gestational diabetes mellitus.

The cord plasma HOMA-IR index was associated with a borderline significant decrease of 7.1% (95%CI − 14.1% to 0.5%; p = 0.067) for a 5 μg/kg increment in placental iodine load, while the same increment is associated with a lower β-cell activity (estimate = − 6.7%; 95%CI − 14.4 to 1.1%; p = 0.09).

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