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Anti Mullerian Hormone (AMH)
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Anti-Müllerian Hormone (AMH) is a hormone secreted by granulosa cells of ovarian follicles. It reflects the ovarian reserve, or the remaining egg supply in a woman’s ovaries
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Anti Mullerian Hormone (AMH) - Comprehensive Test Guide
- Why is it done?
- Measures ovarian reserve and the number of egg-producing follicles in women to assess reproductive potential and fertility status
- Evaluates fertility in women planning pregnancy or undergoing assisted reproductive techniques such as in vitro fertilization (IVF)
- Predicts age-related decline in fertility and evaluates diminished ovarian reserve (DOR)
- Diagnoses or monitors polycystic ovary syndrome (PCOS) in women with irregular cycles or infertility
- Assesses ovarian function and detects premature ovarian failure (POF) or primary ovarian insufficiency (POI)
- Performed typically during the early follicular phase (days 3-5) of the menstrual cycle for optimal accuracy
- May be ordered in women over age 35 seeking fertility consultation, experiencing unexplained infertility, or with family history of early menopause
- Normal Range
- General Normal Range: 1.0 - 3.0 ng/mL (or 7 - 21 pmol/L in SI units)
- Reference ranges may vary by laboratory:
- Normal/Good Ovarian Reserve: 1.5 - 4.0 ng/mL indicates adequate egg supply for fertility purposes
- Low AMH: <1.0 ng/mL indicates diminished ovarian reserve; suggests reduced number of viable eggs and lower fertility potential
- Very Low AMH: <0.3 ng/mL indicates severely diminished or very poor ovarian reserve
- High AMH: >4.0 ng/mL may suggest PCOS, higher ovarian reserve, or potentially increased risk of ovarian hyperstimulation during fertility treatment
- Units of Measurement: ng/mL (nanograms per milliliter) or pmol/L (picomoles per liter)
- Interpretation
- Low AMH Levels (<1.0 ng/mL):
- Indicates reduced number of remaining follicles and declining ovarian function; associated with advanced reproductive age or premature ovarian aging
- May result in fewer eggs retrieved during IVF cycles and reduced fertilization rates; does not necessarily indicate inability to conceive naturally
- Requires reassessment as AMH can fluctuate; elevated FSH levels often accompany low AMH confirming ovarian reserve decline
- Normal AMH Levels (1.5-4.0 ng/mL):
- Suggests adequate ovarian reserve with reasonable number of follicles available; favorable prognosis for fertility treatments and natural conception
- Correlates with age-appropriate ovarian function; indicates potential for good egg retrieval during IVF procedures
- High AMH Levels (>4.0 ng/mL):
- Indicates higher than average number of follicles; often associated with PCOS diagnosis when combined with other clinical findings
- Associated with increased risk of ovarian hyperstimulation syndrome (OHSS) during fertility treatment; may require adjusted stimulation protocols
- May suggest younger ovarian age; positive indicator for quantity of eggs but does not reflect egg quality
- Factors Affecting AMH Results:
- Age is the most significant factor; AMH naturally decreases with advancing reproductive age
- Hormonal contraceptives may suppress AMH levels; oral contraceptives can lower values by 20-30%
- Smoking, body mass index (BMI), and insulin resistance can negatively impact AMH levels
- Previous ovarian surgery or chemotherapy can permanently reduce AMH levels by damaging ovarian tissue
- Cycle day and timing of blood draw; some variation occurs throughout menstrual cycle though AMH is relatively stable compared to FSH
- Laboratory variations and different assay methods can produce different reference ranges; results should be interpreted using the specific lab's reference values
- Associated Organs
- Primary Organ System:
- Reproductive system, specifically the ovaries which produce AMH from granulosa cells in developing follicles
- Pituitary gland and hypothalamus which regulate FSH secretion that stimulates follicle development and subsequent AMH production
- Medical Conditions Associated with Abnormal Results:
- Polycystic Ovary Syndrome (PCOS) - elevated AMH due to numerous small follicles with increased granulosa cell population
- Diminished Ovarian Reserve (DOR) - low AMH indicating accelerated age-related decline in egg quantity
- Premature Ovarian Failure (POF) / Primary Ovarian Insufficiency (POI) - very low or undetectable AMH in women under 40 with menstrual irregularity
- Unexplained Infertility - low AMH may explain infertility in women with normal menstrual cycles
- Ovarian Cancer - may be associated with altered AMH levels; used as potential tumor marker in some cases
- Turner Syndrome - extremely low AMH due to reduced number of primordial follicles
- Autoimmune oophoritis - inflammatory condition affecting ovaries with potential impact on AMH production
- Potential Complications and Risks Associated with Abnormal Results:
- Low AMH - reduced fertility potential, lower pregnancy rates with assisted reproductive technology, need for more aggressive stimulation protocols
- High AMH in PCOS - increased risk of ovarian hyperstimulation syndrome during fertility treatment, higher chance of ectopic pregnancy, metabolic abnormalities
- Psychological impact of low AMH results including anxiety about fertility and reproductive timing
- POI/POF diagnosis implications for quality of life, increased cardiovascular and bone health risks requiring long-term management
- Follow-up Tests
- Recommended Additional Tests Based on AMH Results:
- Follicle Stimulating Hormone (FSH) - measured on cycle day 3; elevated FSH with low AMH confirms diminished ovarian reserve; FSH >10 mIU/mL suggests poor prognosis
- Luteinizing Hormone (LH) - assess pituitary function and LH:FSH ratio; elevated ratio may suggest PCOS
- Estradiol (E2) - measured with FSH to rule out false-low FSH readings and accurately assess ovarian reserve
- Inhibin B - provides additional marker of ovarian reserve; particularly useful in early follicular phase assessment
- Testosterone and Free Androgen Index - if PCOS suspected to evaluate hyperandrogenism
- Thyroid Function Tests (TSH, Free T4) - autoimmune thyroid disease can affect ovarian function; common in POI
- Prolactin levels - elevated prolactin can suppress ovarian function and FSH secretion
- Transvaginal Ultrasound - visualizes ovaries and antral follicle count (AFC); correlates with AMH for ovarian reserve assessment
- Semen Analysis - if infertility evaluation; assess male factor contribution to couple's fertility status
- Hysterosalpingography (HSG) or Diagnostic Laparoscopy - evaluate tubal patency and pelvic pathology if structural issues suspected
- Monitoring Frequency:
- Baseline assessment typically performed once; results relatively stable over months to years
- Repeat testing may be warranted after 1-2 years to assess decline trajectory in women with low AMH or DOR
- If undergoing fertility treatment, may retest to assess response and plan subsequent treatment cycles
- POI/POF patients require ongoing monitoring of ovarian function, metabolic parameters, and cardiovascular risk annually
- Fasting Required?
- Fasting: No - fasting is not required for AMH testing
- AMH levels are not affected by food intake or meal timing; test can be performed at any time of day
- Special Timing Considerations:
- Ideally performed during early follicular phase (cycle days 3-5) for consistency and comparability with baseline values, though AMH is relatively stable throughout cycle
- If patient is on oral contraceptives, should ideally wait 2-3 months after discontinuation for more accurate assessment, as hormonal contraceptives suppress AMH
- Medications to Avoid:
- No specific medications need to be held prior to testing; however, hormonal contraceptives (birth control pills, patches, injections) can lower AMH levels
- If possible, discontinue hormonal contraceptives 2-3 months before testing for most accurate reserve assessment
- Other medications do not significantly affect AMH levels; continue all regular medications unless otherwise directed by provider
- Other Patient Preparation Requirements:
- Minimal preparation needed; standard blood draw procedure with no special positioning or restrictions required
- Wear loose, comfortable clothing to facilitate blood draw access; bring insurance card and photo identification
- Inform phlebotomist if prone to fainting or have difficulty with blood draws; can remain seated or lie down during procedure
- Drink adequate fluids day of testing to improve vein visibility; mild dehydration can make blood draws more difficult
- Can resume normal activities immediately after blood draw; no activity restrictions
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