21-Hydroxyprogesterone is an endogenous steroid intermediate formed during the biosynthesis of corticosteroids in the adrenal cortex. Produced mainly through the hydroxylation of progesterone by the enzyme 21-hydroxylase (CYP21A2), it serves as a key precursor to deoxycorticosterone and subsequently aldosterone and cortisol. Clinically, 21-Hydroxyprogesterone is an important biomarker used to evaluate adrenal steroidogenesis and to screen for congenital adrenal hyperplasia (CAH), particularly 21-hydroxylase deficiency. Its well-defined metabolic role and stable structure make it valuable in endocrinology research, enzyme pathway studies, and diagnostic assay development.
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