Classic Congenital Adrenal Hyperplasia Due to 21-Hydroxylase Deficiency, also known as classic 21-ohd cah, is related to adrenal hyperplasia, congenital, due to 21-hydroxylase deficiency and lipoid congenital adrenal hyperplasia. An important gene associated with Classic Congenital Adrenal Hyperplasia Due to 21-Hydroxylase Deficiency is CYP21A2 (Cytochrome P450 Family 21 Subfamily A Member 2). The drugs Racepinephrine and Immunoglobulins have been mentioned in the context of this disorder. Affiliated tissues include uterus and bone, and related phenotypes are increased circulating androgen concentration and decreased circulating cortisol level