❄️ AMH (Anti-Mullerian Hormone): What Your Number Predicts and What It Does Not

Anti-Mullerian Hormone (AMH) is produced by the small developing follicles in your ovaries. The total amount of AMH in your bloodstream gives a snapshot of how many follicles you have in reserve. It has become the single most ordered fertility test, used to guide IVF protocols, time egg freezing, and counsel patients about reproductive lifespan.

But AMH is also one of the most misinterpreted numbers in fertility medicine. A low AMH does not mean you cannot conceive naturally. A normal AMH does not guarantee future fertility. Here is what your AMH actually tells you — and what it does not.

What AMH Measures

AMH is secreted by the granulosa cells of small antral and pre-antral follicles in your ovaries. Each woman is born with all the eggs she will ever have, and the pool declines steadily with age. Because AMH comes from the small follicles in your current reserve, the level reflects roughly how many follicles you have left.

AMH levels:

• Decline gradually with age from your mid-20s onward
• Drop more steeply after age 35
• Approach undetectable in the years leading up to menopause
• Can be measured at any point in your cycle (unlike FSH and estradiol, which require cycle day 2 or 3)

Typical AMH Ranges by Age

Reference ranges vary slightly between labs, but generally:

• Under 35: 1.5 to 4.0 ng/mL is considered normal range
• 35 to 37: 1.0 to 3.0 ng/mL
• 38 to 40: 0.7 to 2.0 ng/mL
• 41+: 0.3 to 1.5 ng/mL

Units: Some labs report in pmol/L rather than ng/mL. To convert ng/mL to pmol/L, multiply by approximately 7.14.

What AMH Predicts

Ovarian response to IVF stimulation

This is what AMH does best. Higher AMH typically correlates with more eggs retrieved per cycle. AMH is used to:

• Choose starting medication dose
• Predict OHSS risk (very high AMH = higher OHSS risk)
• Counsel patients about likely egg yield

Approximate timing of menopause

Very low AMH can suggest earlier-than-expected menopause, though it is not a precise predictor.

Diagnosis of PCOS

High AMH (typically over 5 to 6 ng/mL in adult women) is one of the criteria for PCOS diagnosis under recent international guidelines.

Egg freezing planning

Used in combination with antral follicle count (AFC) to estimate how many eggs might be retrieved per cycle, and therefore how many cycles may be needed to reach an egg target.

What AMH Does Not Predict

Natural pregnancy chance in a given month

Here is the critical point most patients are not told clearly: AMH predicts egg quantity, not egg quality. Multiple large studies (including a JAMA study by Steiner et al. 2017 in over 750 women) have shown that AMH does not reliably predict the chance of natural conception within 6 to 12 months in women under 40.

A woman with a low AMH can absolutely conceive naturally. A woman with a normal AMH may struggle if other factors are present.

Egg quality

Age predicts egg quality far better than AMH. A 38-year-old with AMH of 3.5 still has age-typical egg quality. A 28-year-old with AMH of 0.7 still has age-typical egg quality.

Whether you will get pregnant from IVF

IVF success rates correlate more strongly with age than AMH. Two women with AMH of 1.0 — one age 32, one age 42 — will have very different IVF success rates.

Time to menopause precisely

AMH gives an approximate trajectory, not a date.

How AMH Should Be Used

Useful applications:

• Choosing IVF stimulation protocols and doses
• Counseling about expected egg yield
• Planning egg freezing strategy
• Identifying patients at higher risk for OHSS
• Supporting PCOS diagnosis
• Identifying premature ovarian insufficiency

Misleading applications:

• Predicting natural conception chances
• Diagnosing infertility on its own
• Counseling young women that they "have plenty of time" based on AMH alone
• Driving panic-buying of fertility services based on a single number

The Antral Follicle Count (AFC) Complement

A transvaginal ultrasound counts the small antral follicles visible in your ovaries on cycle day 2 or 3. AFC is a complementary measure of ovarian reserve:

• 15 or more (combined ovaries): high reserve
• 8 to 14: normal range
• 5 to 7: low
• Less than 5: very low

AFC and AMH typically correlate. Together they give a more complete picture than either alone.

Trends Over Time

A single AMH measurement is informative. A trend (AMH measured every 6 to 12 months) can be more informative — especially if you are deciding whether to freeze eggs now or later. A steep decline argues for sooner; a stable level offers more flexibility.

What to Do With a Low AMH

• Do not panic. A low number does not mean infertility.
• Get an AFC to complement the AMH.
• Consider age in context: a low AMH at age 28 is more concerning than at 42.
• Talk about timing of family building — if you want children, this is information that supports planning, not a verdict.
• Consider fertility preservation if you have time and resources but are not ready to have a child.

What to Do With a High AMH

• Check for PCOS — high AMH plus other features may warrant evaluation.
• Be aware of OHSS risk if IVF is planned.
• High AMH typically means more eggs per IVF cycle, which is a good thing for treatment but does not guarantee success.

Cost

AMH testing is typically covered in Canada through provincial health plans (varying by province and specific criteria) and in the US through many insurance plans when fertility evaluation is indicated. Out-of-pocket cost is typically $50 to $150.

Confirm interpretation with your reproductive endocrinologist. To find clinicians who can evaluate ovarian reserve, use the Fertility Link Navigator.