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Back to Study: The impact of prenatal maternal-fetal metal levels...
mechanistic
Analysis v1
Strong Support

Higher levels of thallium and arsenic in mothers, higher copper levels in the umbilical cord, and less efficient transfer of copper from mother to fetus are linked to lower levels of free thyroxine in newborns, which may indicate these factors play a key role in disrupting fetal thyroid function.

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Pro
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Evidence from Studies

Supporting (1)

48

Community contributions welcome

48

The impact of prenatal maternal-fetal metal levels and placental transfer efficiency of metals on neonatal thyroid function: The modulatory role of maternal vitamin D levels in pregnancy.

Cohort Study
Human
2026 Jan

This study found that when moms are exposed to certain metals like thallium and arsenic, and when too much copper gets passed from mom to baby through the placenta, it can lower a key thyroid hormone in newborns — which is exactly what the claim says.

Contradicting (0)

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

The impact of prenatal maternal-fetal metal levels and placental transfer efficiency of metals on neonatal thyroid function: The modulatory role of maternal vitamin D levels in pregnancy.

Score: 48
DOI: 10.1016/j.envint.2025.110017

Similar Assertions

When more of certain metals and minerals pass from mother to fetus through the placenta, newborns may have higher levels of thyroid-stimulating hormone and lower levels of free thyroxine, which are indicators of altered thyroid hormone regulation.

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86%

How efficiently metals pass from a mother’s bloodstream through the placenta to the fetus is a better indicator of thyroid hormone disruption in newborns than the amount of metals present in the mother’s blood.

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80%

Higher levels of multiple metals in a mother’s blood and her baby’s umbilical cord blood are linked to lower levels of free thyroxine in newborns, which may indicate that exposure to metal mixtures affects fetal thyroid hormone levels more than exposure to single metals.

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78%