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Antenatal thyroid screening and childhood cognitive function.

John H Lazarus1, Jonathan P Bestwick, Sue Channon

  • 1Centre for Endocrine and Diabetes Sciences, Cardiff School of Medicine, Cardiff, Wales, United Kingdom. lazarus@cf.ac.uk

The New England Journal of Medicine
|February 10, 2012
PubMed
Summary
This summary is machine-generated.

Maternal thyroid screening and levothyroxine treatment in pregnancy did not improve child IQ. This study found no significant cognitive benefits for children whose mothers received antenatal thyroid hormone treatment.

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Area of Science:

  • Obstetrics and Gynecology
  • Endocrinology
  • Pediatric Neurology

Background:

  • Maternal hypothyroidism is linked to reduced cognitive function in children.
  • Early detection and treatment of thyroid dysfunction during pregnancy are crucial for fetal development.

Purpose of the Study:

  • To determine if antenatal screening and treatment of maternal hypothyroidism improve child cognitive function.
  • To assess the impact of levothyroxine treatment initiated in early pregnancy on a child's IQ at age 3.

Main Methods:

  • A randomized controlled trial involving pregnant women screened for thyrotropin and free thyroxine (T4) levels early in gestation.
  • Women with positive screening results received levothyroxine treatment, while controls received delayed measurement.
  • Child IQ was assessed at 3 years by unaware psychologists.

Main Results:

  • No significant difference in mean IQ scores was observed between children of mothers in the screening group (99.2) and the control group (100.0).
  • The proportion of children with IQ below 85 was similar in both groups (12.1% vs. 14.1%).
  • On-treatment analysis confirmed the lack of cognitive benefit.

Conclusions:

  • Antenatal screening and maternal levothyroxine treatment for hypothyroidism do not enhance cognitive development in children.
  • The findings suggest that early thyroid hormone supplementation may not be beneficial for neurodevelopment in this context.