Workup for Ovarian Hyperthecosis
Begin with total testosterone measurement as first-line testing; if testosterone is twice the upper limit of normal (typically >2.8 nmol/L or ~80 ng/dL), proceed with DHEAS assay to differentiate adrenal from ovarian sources, followed by pelvic imaging and assessment for insulin resistance. 1
Initial Laboratory Evaluation
Measure total testosterone first using radioimmunological assay following sample extraction or extraction plus chromatography (pending wider availability of mass spectrometry). 1 This is critical because:
- Testosterone levels correlate with severity of hyperandrogenism
- Ovarian hyperthecosis typically produces markedly elevated testosterone (often 5-12 nmol/L or 146-571 ng/dL in documented cases) 2, 3, 4
- The diagnosis requires testosterone elevation to distinguish from PCOS
Algorithmic Approach When Testosterone is Elevated
If testosterone is ≥2× upper limit of normal:
Measure DHEAS immediately 1
- DHEAS >600 µg/dL (16,000 nmol/L) → indicates adrenal adenoma; proceed to abdominal CT
- DHEAS normal or mildly elevated → suggests ovarian source (hyperthecosis vs. tumor)
Perform pelvic imaging (ultrasound or MRI) 2, 4
- Look for ovarian enlargement (often bilateral in hyperthecosis)
- Exclude discrete ovarian masses/tumors
- Note: Ovaries may appear normal-sized with multiple follicles or show bilateral enlargement 4
Assess for insulin resistance 1, 5
- Fasting glucose and HbA1c
- Consider oral glucose tolerance test
- Hyperthecosis is characteristically associated with insulin resistance and metabolic syndrome
Additional Discriminatory Testing
Measure SHBG - typically reduced in hyperthecosis due to insulin resistance and helps calculate free testosterone 1
Consider 17-hydroxyprogesterone to exclude non-classic congenital adrenal hyperplasia (with ACTH stimulation test if basal level elevated) 1, 2
Androstenedione may show dissociated elevation but is less specific 1
Advanced Diagnostic Procedures
If imaging is non-localizing but clinical suspicion remains high:
- Ovarian and adrenal venous sampling can demonstrate ovarian hyperandrogenism without lateralization (indicating bilateral disease rather than tumor) 2, 6
- This is particularly useful when testosterone is in the "tumor range" but no mass is identified
GnRH agonist suppression test - Complete suppression of testosterone with a single dose of GnRH analog supports ovarian hyperthecosis diagnosis, as the androgen production is LH-dependent 1, 2
Critical Pitfalls to Avoid
Do not rely on ultrasound appearance alone - ovarian morphology can be normal, show polycystic changes, or bilateral enlargement; hyperthecosis is a histologic diagnosis 7, 4
Check for medications affecting SHBG - estrogen-containing medications (tamoxifen, raloxifene), thyroid hormones, or antiepileptics can falsely elevate SHBG and alter testosterone interpretation 1
Timing considerations - While testosterone varies minimally through the menstrual cycle in reproductive-age women, confirm absence of interfering medications before interpretation 1
Age-specific considerations:
- In adolescents, do NOT use polycystic ovarian morphology as diagnostic criterion 8
- In postmenopausal women, any virilization with elevated testosterone warrants aggressive workup as hyperthecosis is more common in this age group 7, 6, 5
Definitive Diagnosis
Histopathology remains the gold standard - showing nests of luteinized thecal cells within hyperplastic ovarian stroma 7, 2. However, ovarian biopsy is typically obtained at time of definitive surgical management rather than for initial diagnosis, as the clinical and biochemical picture combined with exclusion of tumors is usually sufficient to proceed with treatment decisions.