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Speciality Spotlight
Thyroid
– Abortion
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Thyroid Antibody titer and Avidity in Patients with Recurrent Miscarriage.
Fertile Steril 71:558-561, 1999.
Several studies have reported an increased incidence of thyroid antibodies in the sera of women with a history of recurrent miscarriage. Thyroid antibodies may serve as a marker for women at risk of miscarriage. The titers of thyroid microsomal antibodies in pregnant women with a history of recurrent miscarriage who had successful pregnancies were compared with those of women who had unsuccessful pregnancies.
Conclusions: Autoimmunity plays a role in recurrent miscarriage. Among women with a history of recurrent miscarriages, the humoral response to pregnancy appears to differ between those whose pregnancies continue to term and those who miscarry again.
Editorial comments: Other studies have shown that the presence of antithyroid antibodies is a risk marker for spontaneous abortion in women with and without a prior history of recurrent miscarriage. All the women in this study had a history of recurrent miscarriage, and all had antithyroid antibodies. The data indicate that there is a direct correlation between the level of thyroid peroxidase antibody titer and avidity and subsequent miscarriage. The exact relation between elevated levels of thyroid peroxidase antibody and poor pregnancy outcome has not been determined. The presence of the antibodies may be an indicator of abnormal T-cell function and not a cause of the miscarriage.