Neonatal screening for congenital hypothyroidism. A decade's review, including South Africa

Area of Science:

• Pediatrics
• Endocrinology
• Neonatal Health

Background:

• Congenital hypothyroidism is the most common disorder detected in neonatal screening programs worldwide.
• It affects 1 in 3,000-8,000 births.
• Early laboratory testing identifies the condition before clinical symptoms manifest.

Purpose of the Study:

• To evaluate the effectiveness of neonatal screening for congenital hypothyroidism.
• To assess the developmental outcomes of screened and treated infants.

Main Methods:

• A screening program in Pretoria tested 45,577 infants between February 1981 and October 1986.
• Laboratory tests assessed thyroid function within the first 5 days of birth.
• Affected neonates received treatment within weeks of diagnosis.

Main Results:

• Eleven cases of congenital hypothyroidism were identified in the Pretoria screening program.
• International experience shows a 10-year track record of diagnosing and treating neonatal hypothyroidism via screening.
• Treated infants demonstrated physical and mental development within normal limits.

Conclusions:

• Neonatal screening for congenital hypothyroidism is highly effective.
• Early diagnosis and treatment are essential for achieving normal developmental outcomes.
• Widespread implementation of screening programs is recommended for global public health.