JOURNAL ARTICLE

Value of combined clinical information and thyroid peroxidase antibodies in pregnancy for the prediction of postpartum thyroid dysfunction

Sheila Mamede da Costa, Lino Sieiro Netto, Claudia Medina Coeli, Alexandru Buescu, Mario Vaisman
American Journal of Reproductive Immunology: AJRI 2007, 58 (4): 344-9
17845204

PROBLEM: To investigate the utility of thyroid peroxidase antibodies (TPOAb) in early pregnancy combined with clinical information for prediction of postpartum thyroid dysfunction (PPTD) within 1 year postpartum.

METHOD OF STUDY: We studied 98 pregnant women by determining their TPOAb levels in early pregnancy, as well as their serum thyrotropin and free thyroid (fT4) levels at 6 and 12 months postpartum. Furthermore, they answered a questionnaire and physical examination was performed by only one examiner.

RESULTS: Of the 98 women, 10 were positive TPOAb in early pregnancy. The overall risk of PPTD within 1 year of follow-up was 10.2% (95% CI 4.1-16.3). Risk of PPTD was significantly higher among women with a family history of thyroid disease, TPOAb positive and presenting goiter in early pregnancy. The sensitivity, specificity and positive predictive value of TPOAb in PPTD prediction were 60.0%, 95.5% and 60%. Restricting screening to women with a family history of thyroid disease or presenting goiter increases the positive predictive value from 60% to 82.4%.

CONCLUSION: Our results suggest that TPOAb could be used as a screening test for PPTD prediction at least among women who present a high risk of developing PPTD.

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