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Screening for congenital adrenal hyperplasia (CAH) caused by 21-α-hydroxylase deficiency is challenging because factors such as prematurity and stress increase intermediate steroid metabolite levels in newborn infants. The objective of this study was to explore the use of the 17-α-hydroxyprogesterone (17-OHP)/11-deoxycortisol ratio as an adjunct measure in the follow-up evaluation of infants with presumptive positive newborn screens for CAH to distinguish between infants with no disorder and those with CAH.

Utility of a precursor-to-product ratio in the evaluation of presumptive positives in newborn screening of congenital adrenal hyperplasia