Causes of Elevated DHEA with Low Testosterone
The combination of high DHEA and low testosterone most commonly indicates either nonclassical congenital adrenal hyperplasia (NCCAH), functional hypothalamic amenorrhea (in women), or primary hypogonadism (in men), depending on the clinical context and additional hormonal findings.
Diagnostic Framework by Sex
In Women
The differential diagnosis requires systematic evaluation of the LH:FSH ratio and additional androgens 1:
Primary Considerations:
Nonclassical CAH (21-hydroxylase deficiency): Presents with elevated DHEA/DHEAS, normal or slightly elevated testosterone, and elevated 17-hydroxyprogesterone. The LH:FSH ratio typically shows LH > FSH 1. An 8 AM 17-hydroxyprogesterone level serves as initial screening, though high-dose ACTH stimulation testing may be necessary for confirmation 1.
Functional Hypothalamic Amenorrhea (FHA): Shows low gonadotropins (LH < 10, FSH < 10), low testosterone (< 50 ng/dL), and low estradiol (< 1 pg/mL), but DHEAS may be normal or elevated 1. This occurs with stress, excessive exercise, or low body weight where adrenal function remains intact while gonadal function is suppressed.
PCOS with adrenal component: Demonstrates LH > FSH, high-normal or elevated testosterone, and high-normal or slightly elevated DHEAS 1. However, this typically shows elevated rather than low testosterone.
Critical Pitfall: When DHEAS levels far exceed normal range (>600 μg/dL or 16,000 nmol/L), consider adrenal tumor 1. Some poorly differentiated adrenal tumors produce higher DHEA than DHEAS 1.
In Men
Primary hypogonadism with preserved adrenal function: Low testosterone with low LH/FSH indicates primary testicular failure, while DHEA production from the adrenal glands remains normal 2. This pattern is common in:
Diabetes mellitus: Mean testosterone levels are lower in men with diabetes compared to age-matched controls, though obesity is a major confounder 2. Sex hormone-binding globulin (SHBG) is often low in diabetes, further reducing bioavailable testosterone 2.
Aging with selective testicular decline: Age-related testosterone decline (1.6% per year starting mid-30s) may occur while adrenal DHEA production remains relatively preserved 3.
HIV on antiretroviral therapy: Protease inhibitors cause insulin resistance and may lead to pancreatic β-cell apoptosis, affecting testosterone production 4.
Mechanistic Considerations
Independent secretion pathways: In normal men, DHEAS does not correlate with testosterone, consistent with independent secretion by adrenal and testis respectively 5. In women, DHEAS correlates strongly with testosterone due to peripheral conversion and parallel adrenal secretion 5.
Peripheral conversion: DHEA serves as a precursor for sex steroid hormones and converts to both testosterone and estradiol in peripheral tissues including skeletal muscle, brain, and skin 6. However, when gonadal production is impaired, this peripheral conversion may be insufficient to maintain normal testosterone levels despite elevated DHEA.
Essential Workup
Morning hormone panel (before 10 AM):
- Total and free testosterone
- LH and FSH (to distinguish primary vs. secondary hypogonadism)
- DHEAS (not just DHEA)
- 17-hydroxyprogesterone if NCCAH suspected 1
- SHBG (often low in diabetes and obesity) 2
Additional testing based on initial results:
- If 17-OHP elevated: ACTH stimulation test for NCCAH confirmation 1
- If DHEAS >600 μg/dL: Adrenal imaging 1
- If virilization present: Androstenedione, comprehensive tumor workup 7
Clinical context matters: Assess for oligomenorrhea, hirsutism, stress, weight changes, exercise patterns (women), and symptoms of hypogonadism including decreased libido, erectile dysfunction, reduced muscle mass (men) 1, 2.
Treatment Implications
The therapeutic approach depends entirely on the underlying diagnosis rather than the hormone pattern itself. Do not treat hormone levels in isolation—treat the identified pathophysiologic condition 7, 8.