In a 33-year-old woman with an elevated serum testosterone level of 2.6 ng/mL, what are the most likely causes and what should be the next diagnostic step?

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Last updated: September 16, 2026 • View editorial policy

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Elevated Testosterone in a 33-Year-Old Woman

The most likely cause is polycystic ovary syndrome (PCOS), but you must systematically exclude life-threatening androgen-secreting tumors and other treatable endocrinopathies before confirming this diagnosis. A testosterone level of 2.6 ng/mL (approximately 90 nmol/L) is moderately elevated and requires a comprehensive endocrine workup 1.

Most Likely Causes

PCOS is by far the most common cause of elevated testosterone in premenopausal women with hyperandrogenism 1. However, the differential diagnosis must include:

  • Ovarian androgen-secreting tumors (Leydig cell tumors, steroid cell tumors)
  • Adrenal tumors (androgen-secreting adenomas)
  • Ovarian hyperthecosis
  • Non-classic congenital adrenal hyperplasia (21-hydroxylase deficiency)
  • Hyperprolactinemia
  • Cushing's syndrome
  • Medication-induced (valproic acid, anabolic steroids)

Critical Next Steps: Systematic Workup

Immediate Clinical Assessment

Look specifically for:

  • Rapid onset or progression of symptoms (suggests tumor)
  • Virilization signs: clitoromegaly, deepening voice, increased muscularity, male pattern baldness (high concern for neoplasm)
  • Menstrual irregularity (suggests PCOS or ovarian dysfunction)
  • Central obesity, acanthosis nigricans (metabolic features of PCOS)
  • Medication history: valproic acid, anabolic steroids, androgenic drugs 1

Essential Laboratory Tests

Order the following tests immediately 1, 2:

  1. DHEA-S (dehydroepiandrosterone sulfate):

    • If >600 µg/dL (16,000 nmol/L), strongly suggests adrenal tumor requiring urgent CT imaging 2
    • Normal DHEA-S points to ovarian source

  2. Early morning 17-hydroxyprogesterone (follicular phase, days 4-10):

    • Screen for non-classic congenital adrenal hyperplasia
    • Particularly important in high-risk ethnic groups (Ashkenazi Jews, Hispanics, Slavics) 1

  3. Prolactin level: Exclude hyperprolactinemia 1

  4. Pregnancy test if amenorrheic 1

  5. SHBG (sex hormone-binding globulin):

    • Helps calculate free testosterone
    • Often reduced in PCOS with insulin resistance 2

Essential Imaging

Pelvic ultrasonography is mandatory to:

  • Detect ovarian neoplasms (even small tumors can produce significant androgens) 1
  • Identify polycystic ovarian morphology
  • Critical caveat: Small androgen-secreting tumors may not be visible on routine imaging 3, 4, 5. If clinical suspicion is high despite negative imaging, consider MRI or selective ovarian vein catheterization 4

Additional Testing Based on Clinical Features

  • Cushing's syndrome screening if cushingoid features present (24-hour urinary free cortisol or overnight dexamethasone suppression test) 1
  • TSH if thyroid dysfunction suspected 1
  • Androstenedione if DHEA-S normal but tumor still suspected 2

Interpretation Algorithm

If DHEA-S >600 µg/dL:

  • Urgent abdominal CT scan for adrenal tumor 2

If DHEA-S normal and testosterone 2-3x upper limit:

  • Ovarian source likely (hyperthecosis or tumor)
  • Pelvic ultrasound/MRI essential
  • Consider GnRH agonist suppression test: testosterone should suppress if ovarian source 2
  • If imaging negative but suspicion high: proceed to laparoscopy or selective ovarian catheterization 4, 5

If workup negative for tumors:

  • Diagnosis of PCOS requires testosterone elevation PLUS either:
    • Anovulation/menstrual irregularity, OR
    • Polycystic ovaries on ultrasound 1

Critical Pitfalls to Avoid

  1. Never assume PCOS without excluding tumors: Even benign ovarian tumors can cause severe morbidity if undiagnosed 3, 5, 6

  2. Don't rely solely on imaging: Androgen-secreting tumors can be small and imaging-occult. Clinical and biochemical correlation is essential 4, 5, 7

  3. Timing matters: Testosterone should be measured early morning, follicular phase (days 4-10) in regularly cycling women for accurate interpretation 1

  4. Laboratory interference: If testosterone level seems discordant with clinical picture (no virilization with very high levels), consider laboratory interference and request diethyl-ether extraction or mass spectrometry confirmation 3

  5. Rapid progression demands urgency: Any rapid onset, progression despite therapy, or virilization signs requires immediate tumor workup, not empiric PCOS treatment 1, 5, 7

Risk Stratification for PCOS

If PCOS is confirmed, assess for metabolic complications that affect long-term morbidity:

  • Insulin resistance/diabetes risk: fasting glucose, HbA1c, consider oral glucose tolerance test
  • Dyslipidemia: lipid panel
  • Cardiovascular risk factors: blood pressure, waist circumference 1

References

2
Guideline

recommendations for investigation of hyperandrogenism.

Annales d'endocrinologie, 2010

6
Research

Leydig Cell Tumour of Ovary in a Postmenopausal Woman: A Rare Occurrence.

Journal of obstetrics and gynaecology of India, 2025

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