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Thyroid function in normal neonates and infants
1Department of Pediatrics, National Taiwan University Hospital, Taipei, R.O.C.
Insights
Thyroid function in Chinese infants shows thyrotropin (TSH) levels drop rapidly after birth. Serum thyroxine (T4) is initially high, decreasing by 6-9 months, while triiodothyronine (T3) increases with age.
Area of Science:
- Pediatrics
- Endocrinology
- Neonatal Health
Background:
- Thyroid hormones are crucial for infant development.
- Establishing reference ranges for thyroid function in neonates and infants is essential for accurate diagnosis.
- Limited data exists on thyroid function specifically in healthy Chinese infants.
Purpose of the Study:
- To determine the normal ranges of thyroid function in healthy Chinese neonates and infants.
- To establish age-specific reference values for serum thyrotropin (TSH), thyroxine (T4), and triiodothyronine (T3).
- To aid in the diagnosis and management of thyroid disorders in early childhood.
Main Methods:
- Prospective study design.
- Blood samples collected from healthy Chinese neonates and infants (birth to 2 years).
- Serum levels of TSH, T4, and T3 measured and analyzed based on age groups.
Main Results:
- Mean serum TSH levels decreased significantly within the first 3 days of life.
- Mean serum T4 concentrations were elevated in the first week, declining to preschool levels by 6-9 months.
- Mean serum T3 levels showed a tendency to increase with age.
Conclusions:
- Thyroid function parameters in Chinese neonates and infants exhibit distinct age-related changes.
- Establishing these reference ranges can help prevent misdiagnosis and inappropriate treatment of thyroid conditions.
- This study provides valuable data for pediatric endocrinology and neonatal care in the Chinese population.
Abstract:
This study was undertaken to determine the thyroid function of normal healthy Chinese neonates and infants from birth to 2 years of age. Our results showed that mean serum thyrotropin (TSH) levels decreased steeply in the first 3 days of life. Mean serum thyroxine (T4) concentration was high in the first 7 days of life and it decreased to the level of normal preschool children at 6-9 months of age. On the other hand, there was a tendency for mean serum triiodothyronine (T3) level to increase with age. It is hoped that the establishment of the ranges of the thyroid function study in normal Chinese neonates and infants can help to avoid misdiagnosis and inappropriate therapy of thyroid disorders during this period of life.