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Journal of Clinical Endocrinology & Metabolism, Vol 57, 349-355, Copyright © 1983 by Endocrine Society

ARTICLES

Amniotic fluid concentrations of iodothyronines and thyrotropin do not reliably predict fetal thyroid status in pregnancies complicated by maternal thyroid disorders or anencephaly

DR Hollingsworth and NM Alexander

In this study we report measurements of amniotic fluid (AF) concentrations of iodothyronines and TSH in 69 normal and 16 complicated pregnancies. The latter group included 2 women with untreated hyperthyroidism, 1 patient with untreated hypothyroidism, 5 hyperthyroid patients who received propylthiouracil (3 with Graves' disease, 1 with a multinodular goiter, and 1 with chronic thyroiditis), 3 women with Graves' disease who were hypothyroid after treatment, but who were receiving replacement therapy, and 5 anencephalic pregnancies. AF hormone levels could not be correlated with either maternal or cord serum values, neonatal serum measurements, and/or the clinical status of the infant. AF TSH and T4 levels were markedly elevated in 1 patient with Graves' disease and severe Rh isoimmunization and in 2 pregnancies complicated by anencephaly without identifiable pituitary tissue in the fetus. We conclude that measurements of AF concentrations of thyroid hormones and TSH do not reliably predict fetal or neonatal thyroid status.


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P. K. Singh, C. A. Parvin, and A. M. Gronowski
Establishment of Reference Intervals for Markers of Fetal Thyroid Status in Amniotic Fluid
J. Clin. Endocrinol. Metab., September 1, 2003; 88(9): 4175 - 4179.
[Abstract] [Full Text] [PDF]


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