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Thyroid function: fetal-maternal relationship at term

T Mungan1, K Vicdan, H Yalcin

  • 1Dr. Zekai Tahir Burak Women's Hospital, Ankara, Turkey.

JPMA. the Journal of the Pakistan Medical Association
|May 1, 1994
PubMed
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Thyroid function in pregnant women and newborns shows distinct differences. Fetal thyroid-stimulating hormone (TSH) is higher, while fetal free triiodothyronine (FT3) is lower than maternal levels at term.

Area of Science:

  • Endocrinology
  • Reproductive Medicine
  • Neonatal Physiology

Background:

  • Thyroid hormones are crucial for maternal health and fetal development.
  • Understanding thyroid function during pregnancy and in newborns is essential for monitoring health outcomes.
  • Maternal thyroid status significantly impacts the intrauterine environment.

Purpose of the Study:

  • To investigate and compare serum thyroid function parameters in normal pregnant women and their fetuses at term.
  • To analyze differences in thyroid-stimulating hormone (TSH), free thyroxine (FT4), thyroxine (T4), free triiodothyronine (FT3), and triiodothyronine (T3) between mothers and newborns.

Main Methods:

  • Collection of paired maternal and umbilical cord blood samples from 56 normal parturients.
  • Measurement of serum TSH, FT4, T4, FT3, and T3 levels in both maternal and fetal samples.

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  • Statistical analysis to compare the measured thyroid hormone levels between maternal and fetal groups.

    • Main Results:

    • Fetal serum TSH levels were significantly higher than maternal TSH levels (P < 0.001).
    • No significant differences were observed in fetal versus maternal T4, FT4, and T3 levels.
    • Cord FT3 levels were significantly lower than maternal FT3 levels (P < 0.001).

    Conclusions:

    • Significant differences exist in specific thyroid hormone levels between term mothers and their fetuses.
    • Elevated fetal TSH and reduced fetal FT3 suggest distinct thyroid regulation in the fetus.
    • These findings contribute to understanding normal thyroid physiology during the perinatal period.