label: Adrenal Gland Hyperplasia III
label_lc: adrenal gland hyperplasia iii
description: Decreased activity of the enzyme 21-hydroxylase, associated with mutation(s) in the CYP21A2 gene. The lack of activity of this enzyme produces a type of congenital adrenal hyperplasia (CAH) and is the cause of approximately 95% of CAH.