Thyroid autoimmunity and infertility

Area of Science:

• Endocrinology
• Reproductive Medicine
• Immunology

Background:

• Thyroid autoimmunity is increasingly recognized as a potential factor in infertility.
• The relationship between thyroid dysfunction, autoantibodies, and fertility outcomes requires further elucidation.

Purpose of the Study:

• To determine the prevalence of thyroid autoimmunity in infertile women.
• To assess the association between thyroid autoantibodies and non-organ-specific autoantibodies.
• To investigate the impact of thyroid dysfunction on pregnancy rates in infertile couples.

Main Methods:

• Assayed serum levels of TSH, free thyroxine, and thyroid autoantibodies (microsomal and thyroglobulin) in 149 infertile women.
• Performed thyroid ultrasound and tested for non-organ-specific autoantibodies in patients with abnormal thyroid function or antibodies.
• Compared infertility duration across groups: normal thyroid, thyroid abnormalities, and euthyroid with thyroid autoantibodies.

Main Results:

• Thyroid abnormalities were found in 20.1% of infertile women; thyroid autoantibodies prevalence was 17.4%.
• A weak association was observed between thyroid autoantibodies and non-organ-specific autoantibodies.
• Only women with thyroid abnormalities and ovulatory dysfunction showed a significantly longer infertility duration compared to controls.

Conclusions:

• While thyroid autoimmunity is prevalent in infertile women, the mere presence of thyroid autoantibodies does not diminish pregnancy chances.
• Thyroid abnormalities coupled with ovulatory dysfunction represent a significant factor contributing to prolonged infertility.