Hormone Testing Diagnosis for Women
Use the diagnosis of Polycystic Ovary Syndrome (PCOS) as your primary framework to guide hormone testing in women presenting with irregular menses, hirsutism, acne, obesity, or infertility. 1
Initial Screening Tests - Required for All Women
When evaluating any woman with suspected hormonal abnormalities, all women must be screened with three essential tests to exclude disorders that mimic PCOS 1:
- TSH (thyroid-stimulating hormone) - to exclude thyroid disease causing irregular cycles
- Prolactin - to exclude hyperprolactinemia presenting as amenorrhea or hirsutism
- 17-OHP (17-hydroxyprogesterone) - to exclude non-classic congenital adrenal hyperplasia, found in 1.5-6.8% of women with androgen excess
These three tests are comparatively easy to perform and effectively exclude the most common PCOS mimickers 1.
Diagnostic Approach Using Rotterdam Criteria
The diagnosis of PCOS requires meeting 2 of 3 criteria 1:
- Androgen excess (clinical hirsutism/acne OR biochemical elevation)
- Ovulatory dysfunction (oligomenorrhea/amenorrhea)
- Polycystic ovaries on ultrasound (≥12 follicles 2-9mm or volume >10mL)
When to Order Additional Hormone Tests
You do NOT need universal androgen screening or ultrasound if the patient already meets 2 of 3 criteria clinically 1. For example, a woman with clear hirsutism and irregular menses has met the diagnostic threshold without biochemical testing.
However, when biochemical confirmation is needed, consider 2:
- Total testosterone - helps delineate causes of hyperandrogenism
- Sex hormone binding globulin (SHBG)
- Free androgen index
- DHEAS (dehydroepiandrosterone sulfate)
Red Flags Requiring Extended Evaluation
In select women with more severe presentations, exclude other serious causes 1:
- Amenorrhea with virilization (clitoromegaly, voice deepening)
- Proximal muscle weakness → consider Cushing's syndrome
- Frontal bossing → consider acromegaly
- Rapid onset or severe symptoms → consider androgen-secreting tumor
For these patients, additional testing beyond the basic three-test panel is warranted.
Critical Pitfall: Age-Related Considerations
Do NOT diagnose PCOS in perimenarchal or perimenopausal women based on oligomenorrhea and polycystic ovaries alone 1. These findings are normal physiological stages.
For adolescents specifically: Diagnosis requires hyperandrogenism (clinical or biochemical) PLUS persistent oligomenorrhea 1. Anovulatory cycles comprise 85% of cycles in year one post-menarche, 59% in year three, making oligomenorrhea alone insufficient for diagnosis.
Clinical Reasoning
The Endocrine Society guideline 1 provides the strongest framework because PCOS is fundamentally a diagnosis of exclusion. The three-test screening panel (TSH, prolactin, 17-OHP) efficiently excludes mimickers before committing to a PCOS diagnosis. This approach prioritizes avoiding misdiagnosis of treatable conditions (thyroid disease, hyperprolactinemia, congenital adrenal hyperplasia) that would require different management and have different long-term implications for morbidity.
The diagnosis you use to guide testing is "suspected PCOS" or "hyperandrogenism workup," but the actual testing algorithm is driven by systematically excluding other causes first, then confirming PCOS features.