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Thyroid size and thyroid function during pregnancy: an analysis

A Berghout1, W Wiersinga

  • 1Department of Medicine, Zuiderziekenhuis, Rotterdam, The Netherlands.

European Journal of Endocrinology
|June 13, 1998
PubMed
Summary
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Thyroid size increases during pregnancy in iodine-deficient areas, but not where iodine is sufficient. These physiological changes help meet increased demands for energy and nutrients.

Area of Science:

  • Endocrinology
  • Reproductive Medicine
  • Nutritional Science

Background:

  • Thyroid function and size undergo physiological adaptations during pregnancy.
  • Iodine intake is a critical factor influencing thyroid adaptations.
  • Human choriogonadotrophin (hCG) may stimulate thyroid function in early pregnancy.

Purpose of the Study:

  • To analyze available studies on thyroid size and function during pregnancy.
  • To investigate the impact of iodine status on thyroid adaptations.
  • To understand the physiological mechanisms underlying thyroid changes in pregnancy.

Main Methods:

  • Systematic analysis of existing studies on thyroid size and function in pregnant individuals.
  • Estimation of thyroid size through palpation and ultrasonography.

Related Experiment Videos

  • Assessment of free thyroxine levels during different pregnancy trimesters.

    • Main Results:

    • Thyroid size increases in iodine-deficient areas but remains stable in iodine-sufficient areas.
    • Increased thyroid size during pregnancy is within normal limits and can be mitigated by iodine or thyroxine supplementation.
    • A transient increase in free thyroxine occurs in the first trimester, followed by a decrease to low-normal levels in later trimesters.

    Conclusions:

    • Thyroid volume and function physiologically adapt during pregnancy to meet increased demands.
    • Autoregulatory mechanisms related to iodine likely drive thyroid growth in iodine-deficient pregnancies.
    • Observed thyroid function changes resemble non-thyroidal illness and may contribute to reduced energy expenditure.