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Antithyroid antibodies and parity

Antithyroid antibodies and parity

Laura G. Greer MD, Brian M. Casey MD, Lisa M. Halvorson MD, Catherine Y. Spong MD, Donald D. McIntire PhD, F. Gary Cunningham MD

American Journal of Obstetrics and Gynecology,
205:5, June 27, 2011

Antithyroid antibodies and parity

Fetal microchimerism may have a role in development of autoimmune thyroid disorders. Using parity as a surrogate for increasing fetal cell exposure, we analyzed its association with thyroid peroxidase antibody levels.

Study Design
Secondary analysis of serum thyroid analytes determined in 17,298 women from a population-based prospective study between 2001 and 2003. Sera were assayed for thyrotropin, free thyroxine, and antithyroid peroxidase antibodies. We analyzed the relationship between thyroid peroxidase antibodies and increasing parity.

The incidence of abnormally elevated thyroid peroxidase antibody levels (>50 IU/mL) increased with advancing parity, but was not significant after adjustment for maternal characteristics. However, at higher thyroid peroxidase antibody levels (>500 IU/mL), a significant relationship with advancing parity persisted after adjustments (P = .002).

Advancing parity is associated with an increased risk for high serum concentrations of antithyroid peroxidase antibodies. This suggests fetal microchimerism may play a role in development of autoimmune thyroid disorders.

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Prepared by: Dr. Awss Zidan

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