What is the role of anti‑Müllerian hormone (AMH) and testosterone in evaluating irregular menstrual cycles?

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Role of AMH and Testosterone in Irregular Menses

AMH and testosterone are valuable diagnostic tools for evaluating irregular menstrual cycles, primarily to identify PCOS as the underlying cause, with testosterone (measured by mass spectrometry) serving as the first-line test for biochemical hyperandrogenism and AMH serving as a supportive marker that correlates with ovulatory dysfunction and androgen levels.

Testosterone Assessment: The Primary Diagnostic Tool

For women with irregular menses, measure total testosterone (TT) and free testosterone (FT) using mass spectrometry as your first-line laboratory tests 1. These provide the highest diagnostic accuracy for identifying biochemical hyperandrogenism in PCOS:

  • TT sensitivity: 74%, specificity: 86%
  • Calculated FT sensitivity: 89%, specificity: 83%
  • Where mass spectrometry is unavailable, use Free Androgen Index (FAI) as an alternative 1

If TT or FT are not elevated but clinical suspicion remains high, consider measuring androstenedione (A4) and DHEAS, though these have poorer specificity 1.

AMH's Role: A Supportive but Not Standalone Marker

AMH levels are significantly elevated in women with irregular cycles, particularly those with PCOS 2. However, current international guidelines do not recommend AMH as a standalone diagnostic test due to several critical limitations:

What AMH Tells You:

  • AMH correlates strongly with menstrual irregularity: Women with AMH in the upper tertile have 8% longer menstrual cycles, and each 1 ng/mL increase in AMH associates with 45% higher prevalence of irregular cycles 3
  • AMH is significantly higher in women with oligo-/amenorrhea compared to those with regular cycles 4, 5
  • AMH reflects ovulatory dysfunction severity: Higher AMH indicates more severe disease state in PCOS, particularly in those with irregular menses 5

Critical Limitations to Consider:

Assay standardization problems: Substantial between-assay variability and sample-to-sample inconsistency make universal cut-offs unreliable 2. Different laboratories may report vastly different values for the same sample.

Age-dependent interpretation:

  • In adolescents (within 8 years of menarche), AMH has poor specificity due to physiological multifollicular ovaries 2
  • In older reproductive-age women, cut-offs may be considerably lower 2

Context-dependent values: AMH interpretation differs based on:

  • Hormonal contraceptive use (significantly lower in users) 3
  • Presence of polycystic ovarian morphology 6
  • Hypothalamic suppression states (may falsely suggest diminished reserve) 6

The Testosterone-AMH Relationship

AMH and testosterone show significant positive correlation (r = 0.36) 4, and this relationship is particularly strong in lean PCOS patients 5. In women with irregular cycles:

  • AMH correlates with all androgen markers (testosterone, FAI, androstenedione, DHEAS) 5, 7
  • Within PCOS patients, testosterone maintains the strongest independent correlation with AMH 5
  • This correlation suggests AMH reflects not just follicle number but also the hyperandrogenic state 8

Practical Clinical Algorithm

For a woman presenting with irregular menses:

  1. First-line testing: Order TT and FT (via mass spectrometry) to assess for biochemical hyperandrogenism 1

  2. If androgens are elevated: Diagnosis of PCOS is supported when combined with oligo-anovulation (irregular cycles already present)

  3. Consider AMH as adjunctive information:

    • Elevated AMH (>4.0 ng/mL in adolescents, though cut-offs vary by assay) supports PCOS diagnosis 7
    • Normal or low AMH does NOT rule out PCOS due to poor sensitivity (only 51%) 7
    • AMH helps assess severity: higher levels indicate more severe ovulatory dysfunction 5

  4. If androgens are normal but AMH is elevated: Consider that AMH alone is insufficient for diagnosis; evaluate for other causes of irregular cycles

Important Caveats

Do not use ultrasound for PCOS diagnosis in adolescents within 8 years of menarche 2. The physiological multifollicular appearance overlaps with PCOS criteria, leading to overdiagnosis.

AMH varies during the menstrual cycle: Levels are significantly higher in late follicular phase compared to ovulation or early luteal phase 9. This variation is less clinically relevant in women with irregular cycles but matters for interpretation.

Hormonal contraceptive users: AMH levels are significantly suppressed in women using hormonal contraceptives, making interpretation unreliable in this population 3. Ideally, measure AMH after discontinuation if clinically feasible.

BMI effects: In lean PCOS, AMH correlates negatively with BMI, but this relationship differs in obese PCOS 5, 8. BMI independently affects the AMH-AFC discordance 8.

Bottom Line for Clinical Practice

Testosterone measurement (TT/FT) is your diagnostic workhorse for irregular menses when PCOS is suspected 1. AMH provides supportive information about ovarian function and disease severity but cannot stand alone due to assay variability, age-dependent interpretation, and insufficient specificity 2, 7. The combination of elevated androgens plus irregular cycles (oligo-anovulation) establishes the diagnosis of PCOS without requiring AMH measurement, though AMH can provide prognostic information about severity of ovulatory dysfunction.

References

2
Guideline

anti-müllerian hormone in pcos: a review informing international guidelines.

Trends in Endocrinology and Metabolism, 2019

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