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Thyroid function in anemic fetuses.

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

¹Harris Birthright Research Centre for Fetal Medicine, Department of Obstetrics and Gynaecology, King's College School of Medicine and Dentistry, London, UK.

Fetal Diagnosis and Therapy

|January 1, 1990

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Fetal red cell isoimmunization in pregnancy affects thyroid function. Studies show elevated thyroid-stimulating hormone (TSH) and thyroid hormones in fetuses with anemia.

Area of Science:

Endocrinology
Maternal-Fetal Medicine
Neonatology

Background:

Red cell isoimmunization is a significant concern in pregnancy.
Fetal anemia can arise from various causes, including isoimmunization.
Thyroid function plays a crucial role in fetal development.

Purpose of the Study:

To investigate thyroid function in fetuses affected by red cell isoimmunization.
To determine the relationship between fetal anemia severity and thyroid hormone levels.

Main Methods:

Analysis of 75 fetal blood samples obtained via cordocentesis.
Measurement of thyroid-stimulating hormone (TSH), free thyroxine (FT4), total thyroxine (T4), free triiodothyronine (FT3), and total triiodothyronine (T3).
Comparison of thyroid hormone levels with those of normal control fetuses.

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Main Results:

Significantly elevated levels of TSH, FT4, T4, FT3, and T3 were observed in fetuses with red cell isoimmunization compared to controls.
A significant positive correlation was found between increased TSH levels and the severity of fetal anemia.
Thyroid hormone levels were abnormal in fetuses with red cell isoimmunization, particularly in those with more severe anemia.

Conclusions:

Red cell isoimmunization in pregnancy is associated with significant alterations in fetal thyroid function.
Elevated TSH and thyroid hormones suggest a potential impact of fetal anemia on the hypothalamic-pituitary-thyroid axis.
Further research is warranted to understand the clinical implications and management of thyroid dysfunction in isoimmunized pregnancies.