Prenatal Maternal Low Selenium, High Thyrotropin, and Low Birth Weights

Area of Science:

• Endocrinology
• Nutritional Science
• Perinatal Health

Background:

• Selenoproteins play a role in thyroid hormone metabolism.
• Thyroid function during pregnancy is crucial for fetal development.
• Maternal nutritional status can impact pregnancy outcomes.

Purpose of the Study:

• To investigate the association between selenium status and hypothyroidism in pregnant women.
• To examine the relationship between maternal thyroid function and infant birth size.

Main Methods:

• Prospective birth cohort study in Shanghai with 1931 pregnant mothers.
• Measurement of maternal serum selenium and thyrotropin (TSH) levels.
• Assessment of newborn birth weight and length, with adjustment for covariates.

Main Results:

• A non-linear association was found between maternal selenium and TSH levels.
• Low maternal selenium (< 103.7 μg/L) was associated with decreased TSH levels.
• Elevated maternal TSH levels were inversely associated with infant birth weight.

Conclusions:

• Low selenium status during pregnancy may be linked to hypothyroidism.
• Maternal hypothyroidism is associated with reduced infant birth weight.
• Adequate selenium intake is important for thyroid function and birth outcomes in pregnancy.