Identifying and treating subclinical thyroid dysfunction in pregnancy: emerging controversies.

Area of Science:

• Reproductive endocrinology
• Maternal-fetal medicine
• Thyroidology

Background:

• Maternal thyroid hormones are crucial for fetal growth and development.
• Thyroid dysfunction during pregnancy is linked to adverse outcomes like infertility, miscarriage, preterm delivery, and fetal neurological impairment.
• While overt hypothyroidism treatment is standard, management of subclinical hypothyroidism, hypothyroxinemia, and positive antithyroid antibodies remains debated.

Purpose of the Study:

• To analyze the current practices and controversies surrounding thyroid dysfunction screening and levothyroxine (LT4) treatment in pregnant women.
• To highlight the discrepancy between clinical guidelines and actual prescription patterns of LT4.
• To emphasize the need for consensus between endocrinologists and obstetricians regarding thyroid disorder management in pregnancy.

Main Methods:

• Review of existing scientific literature and clinical trial data on maternal thyroid dysfunction and its treatment.
• Analysis of current guidelines from various scientific societies.
• Examination of the clinical use of levothyroxine (LT4) in obstetric and reproductive medicine settings.

Main Results:

• Evidence for clear cognitive benefits of treating subclinical hypothyroidism in pregnant women is inconclusive.
• Some studies suggest potential reduction in obstetric and perinatal complications with intervention.
• A significant mismatch exists between guideline recommendations and the widespread clinical use of LT4, alongside differing criteria among medical specialties.

Conclusions:

• The optimal approach to screening for and managing thyroid dysfunction in pregnancy, including the use of levothyroxine (LT4), requires further clarification.
• Concerns regarding overdiagnosis and overtreatment with LT4 are rising.
• Establishing agreement between endocrinologists and obstetricians is essential for standardized and evidence-based patient care.