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Does Hypothyroxinemia of Preterm Neonates Persist Beyond 7 weeks of Life?

Jhulan Das Sharma1, M F H Nazir2, Abdul Gofur Khan3

  • 1Department of Pediatrics, Southern Medical College & Hospital, Southern Medical College Road, East Nasirabad, Khulshi, Chittagong, Bangladesh. drjhulan@gmail.com.

Indian Journal of Pediatrics
|April 5, 2019
PubMed

Insights

Neonatal hypothyroxinemia, a condition of low thyroxine levels, resolves by 7 weeks of age in preterm infants. This study tracked thyroid hormone levels in newborns to confirm normalization.

Area of Science:

  • Neonatal Medicine
  • Endocrinology
  • Pediatrics

Background:

  • Early neonatal hypothyroxinemia is a concern in preterm infants.
  • Thyroid hormone levels are critical for neonatal development.
  • Understanding thyroid hormone normalization is key for clinical management.

Purpose of the Study:

  • To determine if early neonatal hypothyroxinemia resolves by 7 weeks of postnatal age.
  • To investigate thyroid hormone (free T4 and TSH) dynamics in preterm and term neonates.
  • To assess the correlation between thyroid hormones and gestational age.

Main Methods:

  • Observational study of 150 neonates (100 preterm, 50 term) in Bangladesh.
  • Free thyroxine (FT4) and thyroid-stimulating hormone (TSH) measured using chemiluminescent immunometric assay.
  • First samples collected within 5-11 days; second samples from hypothyroxinemic preterms collected within 42-50 days.

Main Results:

  • Positive correlation between FT4 and gestational age in preterm neonates (p < 0.0001).
  • Significant differences in FT4 and TSH levels between the first and second samples in preterm neonates.
  • All neonates with initial hypothyroxinemia showed increased FT4 levels, reaching normal by 7 weeks.

Conclusions:

  • Neonatal hypothyroxinemia, particularly in preterm infants, normalizes by 7 weeks of age.
  • Thyroid hormone levels demonstrate dynamic changes in the early neonatal period.
  • This finding supports the transient nature of some neonatal hypothyroxinemia cases.
Abstract

Keywords:
BangladeshFT4Preterm neonatesTSH

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