What is the recommended work‑up and initial management for a woman in her 40s with markedly elevated total testosterone, elevated free testosterone, and suppressed luteinizing hormone (LH) and follicle‑stimulating hormone (FSH)?

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Urgent Work-up for Androgen-Secreting Tumor

This patient requires immediate imaging with pelvic ultrasound and measurement of DHEAS to rule out an androgen-secreting tumor, as testosterone levels >200 ng/dL (approximately 7 nmol/L) with suppressed gonadotropins strongly suggest either an ovarian tumor or ovarian hyperthecosis rather than PCOS.

Critical Clinical Context

The combination of markedly elevated testosterone (573 ng/dL is roughly 20 nmol/L, which is 10-fold above normal female range) with suppressed LH and FSH is a red flag pattern that differs fundamentally from PCOS, where LH is typically elevated or normal. This hormonal profile indicates autonomous androgen production that is suppressing the hypothalamic-pituitary axis.

Immediate Diagnostic Work-up

Essential First-Line Tests 1, 2:

  • DHEAS measurement: If >600 µg/dL (16,000 nmol/L), this indicates adrenal source and requires abdominal CT immediately 2
  • Pelvic ultrasound: To detect ovarian masses (even small tumors can produce massive androgen excess) 1
  • Prolactin level: To exclude hyperprolactinemia 1
  • 17-hydroxyprogesterone: To exclude non-classic congenital adrenal hyperplasia 1

Critical Physical Examination Findings to Document:

  • Signs of virilization: Clitoromegaly, increased muscularity, deepening voice, male pattern baldness 1
  • Rapid progression: Timeline of symptom onset (sudden onset suggests tumor) 1
  • Palpable masses: Abdominal or pelvic examination 1
  • Acanthosis nigricans: Suggests insulin resistance 1

Differential Diagnosis Priority

1. Androgen-Secreting Ovarian Tumor (Most Concerning)

  • Testosterone >200 ng/dL makes tumor highly likely 1
  • Can be small and difficult to detect on imaging 3, 4
  • Includes Leydig cell tumors, steroid cell tumors 3, 4
  • Malignant in 25-43% of cases 3

2. Ovarian Hyperthecosis

  • Severe hyperandrogenism with suppressed gonadotropins 5, 6
  • More common in postmenopausal women but can occur in 40s 6
  • Associated with insulin resistance 2
  • Benign but requires treatment

3. PCOS (Less Likely Given This Profile)

  • Would typically show elevated or normal LH, not suppressed 1
  • Testosterone elevation usually <2-fold above normal 1
  • This patient's 10-fold elevation argues against PCOS

Diagnostic Confirmation Strategy

If initial imaging is negative but testosterone remains markedly elevated:

GnRH Antagonist Suppression Test 5, 4, 6:

  • Administer cetrorelix or degarelix (GnRH antagonist)
  • If testosterone suppresses: Confirms ovarian source (hyperthecosis or tumor)
  • If testosterone does NOT suppress: Suggests adrenal source or autonomous tumor
  • This test can be both diagnostic and temporarily therapeutic 5, 4

Advanced Imaging if Initial Studies Negative:

  • Ovarian and adrenal vein sampling with multisteroid profiling by LC-MS/MS 5
  • This identifies the exact source when imaging fails to localize

Common Pitfalls to Avoid

  1. Laboratory Interference: With testosterone this high, consider diethyl-ether extraction prior to immunoassay to rule out assay interference 3. However, given suppressed gonadotropins, this is likely real hyperandrogenism.

  2. Missing Small Tumors: Androgen-secreting tumors can be as small as 6mm and still produce massive testosterone elevation 4. Repeat imaging or consider MRI if ultrasound negative.

  3. Assuming PCOS: The suppressed LH/FSH pattern is not consistent with PCOS and should prompt immediate tumor work-up 1.

  4. Medication History: Verify no exogenous androgen use (anabolic steroids, testosterone supplementation) or valproic acid 1.

Management Approach

If Tumor Identified:

  • Surgical excision (salpingo-oophorectomy for ovarian source) 4, 6
  • Testosterone normalizes within 24-48 hours post-operatively 3

If Ovarian Hyperthecosis Confirmed:

  • GnRH antagonist therapy (degarelix) can provide long-term suppression without surgery 5
  • Alternative: Bilateral salpingo-oophorectomy 6

If All Work-up Negative:

  • Consider repeat imaging in 3-6 months
  • Trial of GnRH antagonist both diagnostically and therapeutically 5, 4

Timeline for Action

This requires urgent (within 1-2 weeks) rather than emergent evaluation, but should not be delayed. The risk of malignancy and the degree of androgen excess warrant prompt investigation 1, 3.

References

2
Guideline

recommendations for investigation of hyperandrogenism.

Annales d'endocrinologie, 2010

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