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[TBG, TSH and thyroid hormones in fetus]
Nihon Sanka Fujinka Gakkai Zasshi
|January 1, 1986
Summary
Fetal thyroid hormones like thyroxine (T4) and triiodothyronine (T3) correlate with thyroxine-binding globulin (TBG). Thyroid gland sensitivity to thyroid-stimulating hormone (TSH) increases with gestational age.
Area of Science:
- Endocrinology
- Perinatology
- Fetal Physiology
Context:
- Thyroid hormones are crucial for fetal development.
- Cord serum levels of thyroid hormones and binding proteins provide insights into fetal thyroid status.
- Understanding these relationships is vital for assessing fetal well-being and development.
Purpose:
- To measure cord serum levels of thyroxine (T4), triiodothyronine (T3), reverse T3 (rT3), thyroxine-binding globulin (TBG), and thyroid-stimulating hormone (TSH) in fetuses.
- To investigate the correlations between these thyroid-related factors and gestational age.
- To compare thyroid function parameters between preterm and term fetuses.
Summary:
- Cord serum T3 levels increase, while rT3 levels decrease with advancing gestational weeks.
- Significant positive correlations were found between TBG and T4/T3 levels after specific gestational weeks.
- Cord serum TSH levels differed between preterm and term fetuses, with a lower T4/TSH ratio in preterm infants.
Impact:
- Suggests a close relationship between fetal thyroid hormones and TBG.
- Indicates that the fetal thyroid gland's sensitivity to TSH may increase with gestational age.
- Provides valuable data for understanding fetal thyroid maturation and potential clinical implications.