Thyroid Function Testing in Neonates With Maternal History of Disease

Area of Science:

• Neonatal Medicine
• Endocrinology
• Pediatrics

Background:

• Maternal thyroid disease poses a risk for congenital hypothyroidism in newborns.
• Thyroid-stimulating hormone (TSH) blocking antibodies are a known cause.
• Current guidelines lack specific testing protocols beyond initial newborn screening.

Purpose of the Study:

• To evaluate the necessity of additional thyroid function testing in infants with a maternal history of thyroid disease.
• To identify infants who may be missed by standard newborn screening protocols.

Main Methods:

• Retrospective chart review of 561 newborns with thyroid function tests due to maternal thyroid disease history.
• Assessment of thyroid disease status in 352 infants.
• Analysis of newborn screening data.

Main Results:

• Seven infants were diagnosed with hypothyroidism.
• Three of these infants had negative newborn screening results.
• These three infants required prolonged levothyroxine treatment, indicating persistent hypothyroidism.

Conclusions:

• Infants born to mothers with thyroid disease may require follow-up thyroid function testing beyond the standard newborn screen.
• Delayed testing after initial thyroid level stabilization may be beneficial.
• Early identification and treatment are crucial for managing congenital hypothyroidism.