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Thyroid dyshormonogenesis: severe hypothyroidism after normal neonatal thyroid stimulating hormone screening
F de Zegher1, M Vanderschueren-Lodeweyckx, C Heinrichs
1Department of Pediatrics, University of Leuven, Belgium.
Acta Paediatrica (Oslo, Norway : 1992)
|March 1, 1992
Summary
Neonatal screening for hypothyroidism may miss cases of thyroid dyshormonogenesis. Children with normal early thyroid function can still develop severe hypothyroidism later in childhood.
Area of Science:
- Endocrinology
- Pediatrics
- Genetics
Background:
- Neonatal screening typically identifies primary congenital hypothyroidism.
- Thyroid dyshormonogenesis involves genetic defects in thyroid hormone synthesis.
- Early detection is crucial for preventing developmental issues.
Observation:
- Four children exhibited normal thyroid function tests and growth in the neonatal period.
- These children later developed severe hypothyroidism.
- The hypothyroidism was attributed to thyroid dyshormonogenesis.
Findings:
- Normal neonatal thyroid function does not rule out later-onset hypothyroidism.
- Thyroid dyshormonogenesis can manifest after the neonatal screening window.
- Biochemical and clinical signs may be absent initially.
Implications:
- Neonatal screening protocols may need re-evaluation for certain genetic conditions.
- Extended monitoring may be necessary for infants with a family history of thyroid disorders.
- Early childhood screening for hypothyroidism is essential in at-risk populations.