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Thyroid function in small for gestational age fetuses.

J G Thorpe-Beeston1, K H Nicolaides, R J Snijders

  • 1Harris Birthright Research Centre for Fetal Medicine, Department of Obstetrics and Gynecology, London, United Kingdom.

Obstetrics and Gynecology
|May 1, 1991
PubMed
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Thyroid function in fetuses small for gestational age (SGA) shows higher thyroid-stimulating hormone (TSH) and lower thyroxine (T4) levels. These changes correlate with fetal hypoxemia and acidemia, indicating potential thyroid dysfunction in growth-restricted fetuses.

Area of Science:

  • Perinatology
  • Endocrinology
  • Fetal Medicine

Background:

  • Thyroid hormones are crucial for fetal development.
  • Small for gestational age (SGA) fetuses may experience altered physiological states.
  • Understanding fetal thyroid function in SGA is important for assessing developmental risks.

Purpose of the Study:

  • To investigate thyroid function in fetuses small for gestational age (SGA).
  • To compare thyroid hormone levels between SGA and appropriate for gestational age (AGA) fetuses.
  • To explore correlations between thyroid function and indicators of fetal distress.

Main Methods:

  • Fetal blood samples were collected via funipuncture from 49 SGA and 62 AGA fetuses (21-38 weeks' gestation).
  • Levels of TSH, thyroxine-binding globulin, thyroxine (T4), free T4, triiodothyronine (T3), and free T3 were measured.

Related Experiment Videos

  • Thyroid hormone levels were compared between SGA and AGA groups.
  • Associations with fetal hypoxemia and acidemia were analyzed.

    • Main Results:

    • SGA fetuses exhibited significantly higher TSH levels compared to AGA fetuses.
    • SGA fetuses showed significantly lower T4 and free T4 levels than AGA fetuses.
    • Increased TSH and decreased free T4 were significantly associated with fetal hypoxemia and acidemia, respectively.

    Conclusions:

    • Fetal thyroid function is altered in fetuses small for gestational age.
    • Elevated TSH and reduced T4/free T4 in SGA fetuses suggest potential central hypothyroidism.
    • These thyroid changes are linked to fetal hypoxemia and acidemia, highlighting the impact of intrauterine stress.