In congenital adrenal hyperplasia most common deficiency: (A) 21- alpha hydroxylase deficiency, (B) 11- beta hydroxylase deficiency, (C) 17 - hydroxylase deficiency, (D) 3 beta hydroxylase deficiency
Answer is A. Ans) a (21- alpha ) Ref Nelson 18'h ed p 2360More than 90% of CAH cases are caused by 21 -hydroxylase deficiency.