Abstract
Simultaneous measurement of the 0800-hr plasma concentrations of deoxycorticosterone (DOC), corticosterone (B), 18-hydroxycorticosterone (18-OHB), aldosterone, 18-hydroxydeoxycorticosterone (18-OHDOC) and cortisol (F) in four types of primary aldosteronism provides evidence for primary adrenal disease. Elevated DOC with normal F concentrations in the presence of elevated 18-OHB and aldosterone, and suppressed renin concentration suggests a primary adrenal abnormality of the zona glomerulosa (ZG). Steroid production by the zona fasciculata (ZF), F, 18-OHDOC, and most often B, is normal. These patterns exist only for primary adrenal hyperplasia, aldosterone-producing adenoma (APA), and aldosterone-producing adrenocortical carcinoma (AP-Ca). Elevated DOC levels are rarely found in patients with idiopathic hyperaldosteronism (IHA or adrenal hyperplasia) and suggest that IHA is not a primary adrenal disorder and should be excluded from the syndrome of primary aldosteronism as they have been heretofore.
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