AMH Test Explained (Anti-Mullerian Hormone)
What AMH actually measures, why it is not a fertility forecast, and what an Australian GP or fertility specialist does with the result.
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The Quick Answer
AMH (anti-Mullerian hormone) is produced by the granulosa cells lining small, growing follicles in the ovary, the ones that have started developing but have not yet been recruited for ovulation. The number of these small growing follicles roughly tracks the size of the larger pool of follicles still in reserve, so measuring AMH gives an indirect estimate of that remaining pool. This is usually called your ovarian reserve.
The most important point, and the one most often misunderstood: AMH is a measure of egg quantity, not egg quality, and it is a poor predictor of whether you will conceive naturally this year. A result should never be read as a standalone fertility forecast, and it is not a reason to panic on its own.
AMH falls gradually and predictably with age as the follicle pool is used up, and unlike FSH it can be measured on any day of the menstrual cycle, which is one reason it has become the standard first-line ovarian reserve test in Australian practice.
Typical Australian Reference Ranges by Age
AMH is reported in either pmol/L or ng/mL depending on the laboratory (roughly, 1 ng/mL is about 7.1 pmol/L). These bands are a general guide only, built around commonly cited Australian and international figures, and are not a substitute for the reference range printed on your own report.
Under 25
Reserve is typically at its highest. A low result at this age is unusual and worth investigating.
25 to 29
Wide individual variation is normal even within a narrow age band.
30 to 34
The gradual downward trend becomes more noticeable from this decade onward.
35 to 39
The rate of decline speeds up for most women through the late thirties.
40 to 44
Values below 1 pmol/L are common and do not, by themselves, mean pregnancy is impossible.
45 and over
An undetectable result is expected as menopause approaches and is not, alone, a diagnosis.
What AMH Does Not Tell You
AMH estimates quantity: roughly how many follicles are left in reserve for your age. It says almost nothing about quality: whether the eggs inside those follicles carry normal chromosomes and can produce a healthy pregnancy. Egg quality declines with age largely independently of the AMH number, which is why a woman with a low AMH can still conceive naturally, and a woman with a high AMH is not protected from age-related quality decline.
A widely cited study of women aged 30 to 44 with no known fertility diagnosis, published in 2017, found that AMH level was not meaningfully associated with the chance of conceiving naturally within 6 to 12 months of trying. In other words, AMH performs poorly as a test of natural, unassisted fertility in the general population, even though it performs well in a very different setting: predicting how many eggs an IVF cycle is likely to retrieve.
For this reason, AMH should never be ordered, or interpreted, as a stand-alone answer to "how much time do I have left" or "will I conceive this year". It is one input among several, useful mainly for the specific clinical purposes described below.
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Upload Your Results FreeWhat AMH Is Genuinely Good For
These are the clinical settings where AMH has real, well-supported value, ordered roughly by how strong the evidence is.
Predicting egg yield in an IVF cycle
AMH is one of the best available predictors of how many eggs are likely to be retrieved during a single IVF stimulation cycle. Fertility specialists use it, alongside antral follicle count, to set expectations for a cycle before it begins.
This is the single strongest, best-validated use of AMH in reproductive medicine.
Choosing and adjusting gonadotrophin doses
A very low AMH usually prompts a higher starting dose of stimulation medication to try to recruit more follicles, while a very high AMH (as often seen in PCOS) prompts a lower, more cautious dose to reduce the risk of ovarian hyperstimulation syndrome.
Dosing decisions belong to the treating fertility specialist and are individualised well beyond the AMH number alone.
Supporting a PCOS assessment
AMH is often markedly elevated in polycystic ovary syndrome because of the high number of small growing follicles typical of that condition. It is used as one supporting feature alongside cycle history, clinical signs, and ultrasound findings, not as a diagnosis on its own.
International PCOS guidelines allow AMH as an alternative to a full antral follicle count in some settings, but not as a stand-alone diagnostic test.
Monitoring ovarian damage after chemotherapy or ovarian surgery
AMH measured before and after chemotherapy, or before and after surgery that removes ovarian tissue (such as for endometriomas), shows how much reserve has been lost and helps guide conversations about fertility preservation and future family planning timelines.
This is one of the few settings where Medicare rebates for AMH are more readily available.
A loose, population-level estimate of menopause timing
Because AMH falls toward undetectable as the follicle pool depletes, very low levels in a woman still cycling can suggest menopause is approaching within roughly the next few years. This is useful for broad family planning and hormone therapy discussions.
It estimates a window of years, not a specific date, and should never be the sole basis for stopping contraception.
Interpretation Traps to Watch For
AMH is a genuinely useful test, but it is also one of the more commonly misread numbers on a pathology report. These are the traps that catch people out most often.
There is no single universal reference range
AMH reference ranges are age-banded rather than a single normal-versus-abnormal cut-off, and different professional bodies and different laboratories have published somewhat different age bands. Always read your result against the range printed on your own report.
Results can differ between laboratories and between assay generations
AMH assays have been through several generations of recalibration. Two labs testing the same blood sample can report meaningfully different numbers. Where possible, use the same laboratory for repeat testing so results are genuinely comparable over time.
The combined oral contraceptive pill lowers AMH
Being on the combined pill typically lowers measured AMH by around 20 to 30 percent while it suppresses follicle growth, and the effect can linger for some weeks after stopping. A low result while on the pill may not reflect your true underlying reserve.
Recent pregnancy also lowers AMH
AMH is temporarily suppressed during and shortly after pregnancy. Testing soon after a pregnancy, including after a miscarriage, can understate your usual reserve. Waiting a few cycles after pregnancy gives a more representative result.
Results must always be read against age, not in isolation
A result of, say, 8 pmol/L means something quite different at 28 than it does at 42. The same raw number sits well below the typical range for one age group and comfortably within it for another, so age-matched context is essential every time.
Getting Tested in Australia
AMH is not covered by Medicare when it is ordered as a general fertility assessment, so it is usually a private, out-of-pocket test. Expect to pay roughly 70 to 100 dollars at major Australian pathology providers, on top of the consultation fee for the GP or specialist who orders it. Narrower Medicare rebates do exist for specific indications, such as assessing reserve before chemotherapy, so it is worth asking your GP whether your particular reason for testing qualifies.
AMH is typically ordered alongside, rather than instead of, a small group of companion tests: FSH and LH (usually timed to early in the cycle), oestradiol, and a pelvic ultrasound antral follicle count (AFC). AMH and AFC both estimate reserve, from a blood test and from imaging respectively, while FSH and oestradiol show how hard the pituitary gland is working each cycle to trigger ovulation. Read together, these give a considerably fuller picture than any one result alone.
One practical advantage: because AMH does not depend on where you are in your cycle, it can be booked on any day, including if your periods are irregular or absent, unlike FSH which must be drawn on day 2 to day 4 of the cycle to be interpretable.
What Your GP or Fertility Specialist Does Next
Place the result against your age band
The raw number is read together with your age, since the same value means something different at 28 than it does at 42. Your GP will use the reference range printed on your specific report.
Check for factors that can distort the result
Whether you are currently on the combined contraceptive pill, recently pregnant, or had the sample tested at a different laboratory to a previous result all affect how the number should be read.
Consider companion tests if not already done
FSH, LH, oestradiol, and a pelvic ultrasound antral follicle count are often added to build a fuller picture, particularly if AMH is unexpectedly low or high for your age.
Discuss what the result means for your specific goals
A low AMH in someone not currently trying to conceive may simply prompt a conversation about family planning timelines. A low AMH in someone actively trying, especially over 35, usually prompts earlier referral to a fertility specialist rather than a lengthy wait.
Refer to a fertility specialist if appropriate
Referral is more likely when AMH is very low for age, when there are other risk factors (irregular cycles, prior pelvic surgery, endometriosis, a family history of early menopause), or when natural conception has not occurred after the usual recommended trying period for your age.
Repeat testing only when clinically useful
Because AMH changes slowly, repeating it every few months rarely adds information. It is more often repeated after a meaningful gap of a year or more, or after chemotherapy or ovarian surgery, to track a genuine change rather than normal test-to-test noise.
When to Seek Prompt Medical Review
AMH results are rarely a medical emergency, but a small number of situations warrant seeing your GP promptly rather than waiting for a routine follow-up appointment.
Other situations worth raising sooner rather than later include a strong family history of early menopause (before age 45) combined with a low result for your age, a low AMH after pelvic or ovarian surgery that was not expected based on the procedure, or any new hot flushes, night sweats, or significant cycle changes appearing alongside a low result in your thirties.
None of these situations require an emergency department visit. They warrant a booked GP appointment sooner rather than being left to the next annual check-up.
Related Reading
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Sources and reference ranges
Adult reference ranges on this page follow the AACB and RCPA harmonised reference intervals unless stated otherwise; the range printed on your own report always takes precedence because laboratories differ.
Frequently Asked Questions
What is a normal AMH level for my age in Australia?
There is no single universal normal range because AMH falls steadily with age and results vary between laboratories and assay generations. As a rough Australian guide, women in their late twenties to early thirties typically sit somewhere around 15 to 30 pmol/L, women in their late thirties often sit around 5 to 15 pmol/L, and levels below 5 pmol/L become more common through the early forties as the follicle pool naturally declines. Your own report will state the reference range used by that specific laboratory, and that is the range that applies to your result, not a number from a different lab or a different assay.
Does a low AMH mean I cannot get pregnant naturally?
No. AMH estimates the size of the pool of follicles still available, not the quality of the eggs inside them and not your chance of conceiving in any given cycle or year. A widely cited study of women aged 30 to 44 with no known fertility diagnosis found that AMH level was not associated with the chance of conceiving naturally within 6 to 12 months of trying. A low AMH is a genuine reason to see a GP sooner rather than later if you are trying to conceive, particularly if you are over 35, but it should never be treated as a standalone verdict on your fertility.
What does a high AMH result mean, could it be PCOS?
A markedly elevated AMH, well above the typical range for your age, is common in polycystic ovary syndrome (PCOS), because PCOS ovaries contain an unusually large number of small growing follicles that each produce AMH. High AMH alone does not diagnose PCOS: your GP will usually also consider your cycle regularity, any signs of excess androgen such as acne or excess hair growth, and a pelvic ultrasound. A high AMH in someone without PCOS features is usually simply a marker of a generous ovarian reserve for that age and is not, by itself, a cause for concern.
Can the AMH test be done on any day of my cycle?
Yes, and this is one of the practical advantages of AMH over older ovarian reserve markers. Unlike FSH, which must be measured on day 2 to day 4 of the menstrual cycle to be interpretable, AMH is produced continuously by small growing follicles and stays relatively stable across the cycle. This means AMH can be booked at whatever time suits you, including if your periods are irregular or absent, which is one reason it has become the preferred first-line ovarian reserve test in Australian general practice and fertility clinics.
Does the contraceptive pill affect AMH test results?
Yes. The combined oral contraceptive pill suppresses the growth of small follicles and typically lowers measured AMH by around 20 to 30 percent while you are taking it, and the effect can persist for some weeks after stopping. Recent pregnancy also lowers AMH. If you are on the pill or have recently been pregnant when your AMH is tested, tell your GP, because the result may understate your true underlying reserve. Where possible, testing after several months off the pill gives a more representative result.
Is the AMH test covered by Medicare in Australia?
AMH testing for general fertility assessment is usually not funded by Medicare and is typically a private, out-of-pocket test costing around 70 to 100 dollars at major Australian pathology providers, on top of the standard consultation fee. Medicare rebates for AMH exist for specific, narrower clinical indications, such as assessing ovarian reserve before fertility-damaging chemotherapy. Ask your GP or the pathology provider directly what the out-of-pocket cost will be for your particular reason for testing, since it depends on the clinical indication written on the request form.
What other tests are usually done alongside AMH?
A GP or fertility specialist investigating ovarian reserve typically orders AMH alongside FSH (follicle stimulating hormone), LH (luteinising hormone), and oestradiol, usually timed to early in the cycle for the cycle-dependent hormones, plus a pelvic ultrasound to count the antral follicles visible on the ovaries (the antral follicle count, or AFC). Together these give a fuller picture than AMH alone: AMH and AFC both estimate reserve from different angles, while FSH and oestradiol show how hard the pituitary gland is having to work to trigger ovulation each cycle.
Can AMH predict when I will go through menopause?
AMH gives a loose, population-level estimate of menopause timing rather than a precise personal prediction. Because AMH falls as the follicle pool depletes and becomes undetectable around the time of menopause, a very low or undetectable AMH in someone still having periods can suggest menopause is approaching within the next few years, which is useful for family planning and for discussing hormone therapy timing. It is not accurate enough to name a specific year, and it should not be used on its own to decide when to stop contraception.
Why did my AMH results differ between two different pathology labs?
AMH assays have gone through several generations, and different Australian laboratories can use different assay platforms with different calibration, which means results for the same blood sample can genuinely differ between labs, sometimes by a meaningful margin. There is also no single international reference range that all labs have adopted. For this reason, it is best to have follow-up AMH tests done at the same laboratory using the same assay whenever possible, and to always read your result against the reference range printed on that specific report rather than a range you have seen elsewhere.
This page provides general educational information about anti-Mullerian hormone (AMH) and ovarian reserve testing. It is not a substitute for professional medical advice, diagnosis, or treatment. Fertility assessment is highly individual: always discuss your AMH result and overall reproductive health with your GP or fertility specialist. SmarterBlood does not provide medical care.