NCIt synonyms : CYP21 Deficiency; 21-Hydroxylase Deficieny; CAH1; Adrenal Gland Hyperplasia, Congenital, due to 21-Hydroxylase Deficiency; Congenital Adrenal Hyperplasia 1;
NCIt definition : 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.;