What Is a Normal 17-OHP Level?
The normal 17-OHP range is Below 200 ng/dL. Values below or above this range may indicate a condition that requires further evaluation.
Reference Range Table
| Marker | Low | Normal | High |
|---|---|---|---|
| 17-OHP (early-morning, follicular phase) | Low values are not clinically significant | Below 200 ng/dL | Above 200 ng/dL — screen positive; an ACTH stimulation test is needed to rule out nonclassic congenital adrenal hyperplasia |
What Affects Your Results
Time of day is the biggest factor — 17-OHP peaks in the early morning and falls through the day, so an afternoon draw can read misleadingly low. It also rises after ovulation and in pregnancy, so the follicular phase (roughly days 2-8) is the interpretable window. Glucocorticoid medication lowers it.
When to Retest
A single well-timed screen is usually enough. If it is elevated, the next step is an ACTH stimulation test arranged by a clinician, not a repeat of this one. Retest only if the first sample was mistimed.
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