21-Deoxycortisone is a corticosteroid metabolite of 11-keto progesterone.1 It is formed from 11-keto progesterone by the cytochrome P450 (CYP) isoform CYP17A1, but can also be produced via oxidation of 21-deoxycortisol by 11β-hydroxysteroid dehydrogenase type 2 (11β-HSD2). Levels of 21-deoxycortisone are increased in patients with congenital adrenal hyperplasia, an inborn error of metabolism characterized by a deficiency in 21-hydroxylase.2
1.van Rooyen, D., Yadav, R., Scott, E.E., et al.CYP17A1 exhibits 17αhydroxylase/17,20-lyase activity towards 11β-hydroxyprogesterone and 11-ketoprogesterone metabolites in the C11-oxy backdoor pathwayJ. Steroid Biochem. Mol. Biol.199105614(2020) 2.Saisho, S., Shimozawa, K., and Yata, J.Changes of several adrenal δ4-steroids measured by HPLC-UV spectrometry in neonatal patients with congenital adrenal hyperplasia due to 21-hydroxylase deficiencyHorm. Res.33(1)27-34(1990)