We investigated the value of serum levels of adrenal steroids (dehydroepiandrosterone sulphate, testosterone, 17-hydroxyprogesterone, cortisol) in the identification in peripubertal females with late-onset congenital adrenal hyperplasia owing to 21-hydroxylase deficiency. Among 68 females (age 3\p=n-\18 years) with virilization in childhood, peripubertally or postpubertally, we selected 21 girls for an ACTH test by measurement of basal blood-spot or serum 17-hydroxyprogesterone (17-OHP) levels. Eight of 21 patients had supranormal post-ACTH serum 17-OHP concentration
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