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Subclinical hyperthyroidism and pregnancy outcomes.

Brian M Casey1, Jodi S Dashe, C Edward Wells

  • 1Department of Obstetrics and Gynecology, the University of Texas Southwestern Medical Center, Dallas, 75390, USA. brian.casey@utsouthwestern.edu

Obstetrics and Gynecology
|February 2, 2006
PubMed
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Subclinical hyperthyroidism in pregnancy did not increase adverse outcomes. This study suggests routine treatment for suppressed thyroid-stimulating hormone (TSH) and normal free thyroxine (fT4) during pregnancy is unnecessary.

Area of Science:

  • Endocrinology
  • Obstetrics
  • Perinatal Medicine

Background:

  • Subclinical hyperthyroidism, defined by suppressed TSH and normal fT4, has potential long-term health risks.
  • Pregnancy outcomes in women with subclinical hyperthyroidism require further investigation.

Purpose of the Study:

  • To evaluate pregnancy outcomes in women with suppressed TSH and normal fT4 levels.
  • To determine if subclinical hyperthyroidism impacts maternal and fetal health during gestation.

Main Methods:

  • A cohort of 25,765 pregnant women underwent thyroid screening using chemiluminescent TSH assay.
  • Subclinical hyperthyroidism was identified by TSH at or below the 2.5th percentile for gestational age and fT4 ≤ 1.75 ng/dL.
  • Outcomes were compared between women with subclinical hyperthyroidism and those with normal TSH levels (5th-95th percentile).

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Main Results:

  • 1.7% of women (433) had subclinical hyperthyroidism, more common in African-American and parous women.
  • Hypertension was less frequent in pregnancies with subclinical hyperthyroidism (aOR 0.66).
  • No increased risk of other pregnancy complications, perinatal morbidity, or mortality was observed.

Conclusions:

  • Subclinical hyperthyroidism is not associated with adverse pregnancy outcomes.
  • Current evidence suggests that identifying and treating subclinical hyperthyroidism during pregnancy is not warranted.
  • Further research may explore specific subgroups or long-term effects.