title: Late-onset 21-hydroxylase deficiency: reliable diagnosis by steroid analysis of random urine collections.
abstract: The feasibility of performing steroid analysis by capillary gas chromatography on random urine samples for the detection of mild late-onset 21-hydroxylase deficiency was evaluated. Comparisons were made of basal excretions of androgen and 17 alpha-hydroxyprogesterone metabolites with plasma levels (basal and stimulated) of 17 alpha-hydroxyprogesterone and testosterone in six patients with the disorder. The following steroid metabolite excretion ratios were determined for normal controls and affected individuals. 1) 17 alpha-hydroxypregnanolone/tetrahydrocortisone + tetrahydrocortisol + 5 alpha-tetrahydrocortisol (cortisol metabolites) (normal 0.017-0.10, affected 0.17-0.42); 2) pregnanetriol/cortisol metabolites (normal 0.03-0.15, affected 0.17-0.99); 3) pregnanetriolone/cortisol metabolites (normal 0.02-0.014, affected 0.08-0.20); 4) androsterone + etiocholanolone/cortisol metabolites (normal 0.26-1.02, affected 0.34-1.47). Among the 21-deoxy steroid ratios, there was no overlap between affected and unaffected individuals. Two of six affected individuals had androsterone + etiocholanolone/cortisol metabolite ratios in the normal range. This method provides excellent discrimination between normal and affected individuals, precluding the need for an ACTH-stimulation test. It is anticipated that it will be increasingly used for diagnosis of the condition.
mesh_terms: D000293:Adolescent; D000312:Adrenal Hyperplasia, Congenital; D000328:Adult; D000738:Androsterone / Q000652:urine; D002648:Child; D002849:Chromatography, Gas; D005043:Etiocholanolone / Q000652:urine; D005260:Female; D006801:Humans; D008875:Middle Aged; D011279:Pregnanetriol / Q000031:analogs & derivatives / Q000652:urine; D011280:Pregnanolone / Q000031:analogs & derivatives / Q000652:urine; D013250:Steroid Hydroxylases / Q000172:deficiency*; D013256:Steroids / Q000097:blood / Q000652:urine*; D013760:Tetrahydrocortisol / Q000031:analogs & derivatives / Q000652:urine; D013761:Tetrahydrocortisone / Q000652:urine
chemical_list: D013256:Steroids; D011279:Pregnanetriol; C006461:allotetrahydrocortisol; C013051:17-hydroxypregnanolone; D013761:Tetrahydrocortisone; C009030:pregnanetriolone; D013760:Tetrahydrocortisol; D005043:Etiocholanolone; D011280:Pregnanolone; D000738:Androsterone; D013250:Steroid Hydroxylases