Idiopathic and mild subclinical hypothyroidism in childhood: clinical management

Area of Science:

• Pediatric Endocrinology
• Thyroid Disorders
• Clinical Management

Background:

• Subclinical hypothyroidism (SH) is a frequent clinical issue in pediatric populations.
• Management and natural progression of SH present numerous controversies.
• Idiopathic SH in children requires careful evaluation due to these uncertainties.

Purpose of the Study:

• To review the current understanding of idiopathic subclinical hypothyroidism in pediatric patients.
• To address controversial aspects of SH natural history and treatment in children.
• To synthesize evidence on the effects of mild TSH elevation in the pediatric population.

Main Methods:

• Systematic review of full-length articles focusing on natural history and treatment of SH in children.
• Inclusion criteria specified no associated diseases or genetic syndromes.
• Analysis of 13 selected papers providing retrospective or longitudinal data.

Main Results:

• Mild TSH elevation (5-10 mIU/L) in SH children without underlying disease did not affect growth, bone maturation, BMI, or cognitive function.
• The risk of thyroid function deterioration in untreated mild idiopathic SH is approximately 12%.
• Progression is more likely with higher baseline TSH, goiter, or positive anti-thyroid antibodies.

Conclusions:

• Levothyroxine (L-T4) treatment is not indicated for SH with TSH levels consistently between 5-10 mIU/L after excluding underlying conditions.
• Treatment is advised for SH cases with TSH >10 mIU/L or when an underlying disease is present.
• Current evidence suggests a conservative approach for mild, idiopathic SH in children, reserving L-T4 for more severe or complicated cases.