How is late-onset congenital hyperplasia due to 21-hydroxilase deficiency differentiated from polycystic ovarian syndrome (PCOS)?

Updated: Sep 19, 2019
  • Author: Richard Scott Lucidi, MD, FACOG; Chief Editor: Richard Scott Lucidi, MD, FACOG  more...
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Late-onset congenital adrenal hyperplasia due to 21-hydroxylase deficiency can be ruled out by measuring serum 17-hydroxyprogesterone levels after a cosyntropin stimulation test. A 17-hydroxyprogesterone level of less than 1000 ng/dL—measured 60 minutes after cosyntropin stimulation—rules out late-onset congenital adrenal hyperplasia.

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