Which female hormones should be measured to assess endometriosis and associated hair loss?

Hormone Testing for Endometriosis and Hair Loss

For hair loss in women, measure total testosterone (preferably by LC/MS), free testosterone, DHEAS, SHBG, and TSH; however, for endometriosis diagnosis, hormone testing is not recommended as it lacks diagnostic utility.

Hair Loss Hormone Evaluation

The 2019 Androgen Excess and PCOS Committee guideline 1 provides clear direction on hormone testing for female pattern hair loss (FPHL):

Essential Hormone Panel for Hair Loss:

• Total testosterone - Use liquid chromatography-mass spectrometry (LC/MS) rather than standard immunoassays, as immunoassays are unreliable without extraction and purification 1
• Free testosterone - More sensitive than total testosterone for detecting androgen excess; use equilibrium dialysis, ultracentrifugation, or ammonium sulfate precipitation methods 1
• DHEAS (dehydroepiandrosterone sulfate) - To assess adrenal androgen production
• SHBG (sex hormone-binding globulin) - Essential for calculating free testosterone accurately 1
• TSH - Hypothyroidism is an important hormonal disturbance in androgenic hair loss 2

Important Caveats:

Despite the theoretical rationale for hormone testing, most women with hair loss show no significant hormonal abnormalities 3. A 2020 study found that only 6.8% of women with female pattern hair loss had elevated free testosterone, and 40% who reported symptoms suggestive of hormonal disorders (menstrual irregularities, hirsutism, acne) showed no significant abnormalities on testing 3. The most common finding was actually elevated SHBG (38.8%) and decreased total testosterone (25.4%) 3.

Endometriosis Hormone Evaluation

Hormone testing is not useful for diagnosing endometriosis. Current guidelines from multiple societies 4, 5, 6, 7 emphasize that:

• Endometriosis diagnosis relies on clinical symptoms, physical examination, and transvaginal ultrasound - not hormone levels 5
• The 2026 German/Austrian/Swiss guideline explicitly states that transvaginal ultrasound is the central diagnostic procedure, with primary hormone treatment recommended therapeutically, not diagnostically 5
• No circulating hormone levels reliably predict or diagnose endometriosis 4

Research Context (Not for Clinical Use):

While research studies have examined estrogen metabolites in endometriosis 8, 9, 10, these are investigational markers not validated for clinical diagnosis. Higher 2-hydroxy estrogen metabolites were associated with endometriosis in research settings 10, but these specialized assays are not part of standard clinical practice.

Clinical Algorithm

For a patient presenting with both hair loss and suspected endometriosis:

1. Address hair loss hormonally:

   • Order: Total testosterone (LC/MS), free testosterone, DHEAS, SHBG, TSH
   • If signs of hyperandrogenism (hirsutism, acne, menstrual irregularities): Add androstenedione
   • Consider adding thyroid antibodies (ATPO) if TSH abnormal, as 17.3% of hair loss patients show elevated ATPO 3

2. Address endometriosis clinically:

   • Focus on symptom assessment (dysmenorrhea, chronic pelvic pain, dyspareunia, infertility)
   • Perform transvaginal ultrasound 5
   • Consider clinical diagnosis based on symptoms and response to hormonal therapy 6, 7
   • Reserve laparoscopy for cases requiring definitive diagnosis or surgical management 4

Critical pitfall: Do not delay endometriosis treatment waiting for hormone results, as hormone levels do not guide endometriosis diagnosis or management 5, 6.