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Persistent hyperthyrotropinaemia since the neonatal period in clinically euthyroid children
L A Tyfield1, S S Abusrewil, S R Jones
1Neonatal Screening Laboratory, Southmead Hospital, Bristol, UK.
European Journal of Pediatrics
|March 1, 1991
Summary
Mild hyperthyrotropinemia in children, identified through neonatal screening, indicates compensated hypothyroidism. These children show normal growth and development without thyroid hormone replacement therapy.
Area of Science:
- Pediatric Endocrinology
- Neonatal Screening
- Thyroid Function Testing
Background:
- Persistent mild elevation of thyroid stimulating hormone (TSH) since the neonatal period can occur.
- Normal thyroid hormone levels (thyroxine and triiodothyronine) are crucial for development.
- Distinguishing true thyroid dysfunction from transient or artifactual elevations is essential.
Purpose of the Study:
- To describe the long-term outcomes of children with persistent mild hyperthyrotropinemia.
- To investigate the clinical significance of this condition in the absence of overt hypothyroidism.
- To assess the potential for compensated hypothyroidism in affected individuals.
Main Methods:
- Longitudinal follow-up of three children identified with persistent mild hyperthyrotropinemia.
- Regular monitoring of thyroid stimulating hormone and thyroid hormone levels.
- Assessment of growth parameters and neurodevelopmental milestones.
Main Results:
- Three children aged 5-6 years maintained elevated TSH levels since birth with normal free thyroxine and triiodothyronine.
- No evidence of artifactual elevation or antibody interference was found.
- All children exhibited normal growth and psychomotor development without thyroid hormone treatment.
Conclusions:
- Persistent mild hyperthyrotropinemia in the neonatal period may represent a compensated hypothyroid state.
- These children may not require thyroid hormone replacement therapy if growth and development remain normal.
- Neonatal screening for congenital hypothyroidism is crucial for early identification and appropriate management, preventing potential later-onset juvenile hypothyroidism.