Precursor to cortisol in adrenal steroidogenesis. Markedly elevated in 21-hydroxylase deficiency (most common cause of congenital adrenal hyperplasia, CAH). Sample at 8–9 AM.
| Sex | Age | Range | Notes |
|---|---|---|---|
| All | ≥ 18 yrs | < 6 | Adult (early follicular phase in women; AM value) |
⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.