- Follicular 17-hydroxyprogesterone > 300 ng/dl, which suggests the possibility of congenital adrenal hyperplasia (if elevated during the luteal phase and there is a concern about the possibility of congenital adrenal hyperplasia, the 17-hydroxyprogesterone may be collected during the follicular phase, or >60 if oligomenorrheic). NOTE: If a 17-hydroxyprogesterone > 300 ng/dl is confirmed on repeat testing, an ACTH stimulated 17-hydroxyprogesterone < 1000 ng/dl will be required for study participation.