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Thyrotrophin estimation in diagnosis and treatment of childhood thyroid disorders
Insights
Thyroid-stimulating hormone (TSH) levels in children are generally stable. Elevated TSH indicates thyroid dysfunction, but normal TSH with low thyroxine suggests other issues, requiring careful monitoring during treatment.
Area of Science:
- Pediatric Endocrinology
- Thyroid Disorders
- Radioimmunoassay Techniques
Background:
- Thyroid-stimulating hormone (TSH) is a key regulator of thyroid function.
- Understanding normal TSH ranges in children is crucial for diagnosing thyroid conditions.
- Variations in TSH can indicate various thyroid abnormalities.
Purpose of the Study:
- To establish reference ranges for serum TSH in a pediatric population.
- To investigate the correlation between TSH levels and different thyroid conditions in children.
- To evaluate TSH levels in children undergoing treatment for hypothyroidism.
Main Methods:
- Serum TSH was measured using a double-antibody radioimmunoassay.
- The study included 200 children aged 2 months to 16 years with normal thyroid function.
- TSH levels were also assessed in 20 children receiving treatment for primary hypothyroidism.
Main Results:
- No significant variation in TSH was observed with age or sex in the healthy cohort.
- Elevated TSH levels were associated with primary hypothyroidism, thyroiditis, and thyroid dysgenesis (lingual, ectopic).
- Normal TSH with low thyroxine was noted in iodine organification defects and thyroxine-binding globulin deficiency; some treated hypothyroid children had elevated TSH despite therapy.
Conclusions:
- Serum TSH is a reliable indicator for diagnosing primary hypothyroidism and other thyroid disorders in children.
- Certain conditions, like thyroxine-binding globulin deficiency, may present with normal TSH despite low thyroxine.
- Monitoring TSH is essential during L-thyroxine replacement therapy to ensure adequate treatment and detect non-compliance or resistance.
Abstract:
Serum thyrotrophin (TSH) was estimated by double-antibody radioimmunoassay in 200 children aged 2 months to 16 years with normal thyroid function. There was no apparent variation in TSH with age or sex and only 4 children had TSH levels greater than 5 muU/ml. High TSH values were obtained in 9 children with primary hypothyroidism, in 3 children with thyroiditis, and in one girl with a lingual thyroid. Moderately raised TSH was found in 3 girls with thyroiditis, 2 brothers with goitres due to enzyme defect, and a girl with an ectopic thyroid. In one girl with a defect of iodine organification and in 3 boys with thyroxine binding globulin deficiency the TSH levels were normal despite very low serum thyroxine values. Serum TSH was also estimated in 20 children during treatment for primary hypothyroidism. 3 of these children showed slightly raised TSH levels despite apparently adequate replacement therapy with L-thyroxine. One girl showed a very high TSH level 3 weeks after treatment had been temporarily withdrawn.