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Congenital hypothyroidism with hereditary, raised thyroxine binding globulin
Insights
A rare combination of congenital hypothyroidism and hereditary raised thyroxine binding globulin led to under-treatment in a boy. This resulted in delayed bone maturation and growth until thyroid stimulating hormone testing became standard.
Area of Science:
- Pediatric Endocrinology
- Clinical Genetics
- Thyroid Disorders
Background:
- Congenital hypothyroidism (CH) requires lifelong thyroid hormone replacement therapy.
- Hereditary thyroxine binding globulin (TBG) deficiency can affect thyroid hormone level interpretation.
- The interplay between CH and hereditary TBG abnormalities is rarely reported.
Observation:
- A case study of a boy with both CH and hereditary elevated TBG is presented.
- The patient was initially undertreated for his thyroid deficiency.
- Serum thyroid stimulating hormone (TSH) measurement was crucial for accurate diagnosis and management.
Findings:
- The combination of CH and hereditary elevated TBG led to delayed diagnosis and inadequate L-thyroxine treatment.
- Inadequate treatment between ages 2 and 7 years resulted in retarded bone maturation and poor growth velocity.
- Educational difficulties may have been exacerbated by the prolonged thyroid hormone deficiency.
Implications:
- Highlights the importance of TSH in diagnosing and managing thyroid disorders, especially in complex cases.
- Underscores the need for careful monitoring and appropriate L-thyroxine dosing in children with CH and genetic variations affecting thyroid hormone transport.
- Suggests a potential link between early-life thyroid deficiency and later educational outcomes.
Abstract:
A boy with congenital hypothyroidism and hereditary raised thyroxine binding globulin is described. This hitherto unreported combination resulted in under treatment of the thyroid deficiency until serum thyroid stimulating hormone measurement became routinely available. Inadequate L-thyroxine replacement treatment between 2 and 7 years of age caused retarded bone maturation, poor growth velocity, and probably added to his educational difficulties.