Extraadrenal Steroid 21-Hydroxylase Activity in a Woman with Congenital Adrenal Hyperplasia due to Steroid 21-Hydroxylase Deficiency*

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Abstract
The 21-hydroxylation of plasma progesterone (P) has been demonstrated in pregnant, nonpregnant, and adrenalectomized women and in men. The fractional conversion of plasma progesterone to deoxycorticosterone (DOC), [P]P-DOCBU, among those subjects was 0.009 ± 0.001 (mean ± SEM, n = 32).The [p]P-DOCBu in a woman with congenital adrenal hyperplasia due to apparent adrenal steroid 21-hydroxylase deficiency was 0.010 when she was taking cortisone acetate, and the [p]P-DOCBu determined when she was not taking cortisone acetate was 0.012. Moreover, the value computed for the fractional conversion of 17α-hydroxyprogesterone to 11-deoxycortisol in this woman (0.004) was similar tothat observed in a woman with normal adrenal function (0.005). Therefore, extraadrenal 21-hydroxylase activity in a woman with nonsalt-losing congenital adrenal hyperplasia due to 21-hydroxylase deficiency was similar to that found in persons with normal adrenal function.