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What is the most common cause of congenital adrenal hyperplasia?
The most common cause of congenital adrenal hyperplasia is deficiency of 21-hydroxylase.
This accounts for >90% of cases of congenital adrenal hyperplasia and represents 1:14,000 live births.
What are the other causes of congenital adrenal hyperplasia?
Deficiency of 11β-hydroxylase activity (5% to 8% of cases) is the second most common cause of congenital adrenal hyperplasia.
Rare causes include 3β-hydroxysteroid dehydrogenase deficiency, 17α-hydroxylase deficiency, and lipoid congenital adrenal hyperplasia.