Low AMH Explained
What anti-Mullerian hormone actually tells you about your fertility, typical ranges by age, and what your doctor will likely do next, in plain English.
Free to use, no credit card, works with any Australian lab
· · Reviewed against the sources listed at the end of this page.
The Quick Answer
AMH (anti-Mullerian hormone) is produced by the small, early-stage follicles in your ovaries. Because the number of these follicles reflects how many eggs you have left, a low AMH result mainly means fewer remaining eggs, what doctors call ovarian reserve.
A low AMH does not measure the quality of your eggs, and it does not tell you your chance of conceiving naturally in any given month. It declines gradually with age in everyone, and it matters most when planning IVF, because it helps predict how many eggs a stimulation cycle is likely to collect. Many women with a low AMH still conceive naturally, and many decisions about timing and options are still open to you.
What AMH Actually Measures
Every woman is born with a fixed pool of eggs that only ever decreases, it is never replenished. Each month, a small group of resting follicles is recruited and starts to develop, and the cells lining those early follicles produce anti-Mullerian hormone. The more small follicles you have waiting in reserve, the higher your AMH tends to be.
This is why AMH is used as a proxy for ovarian reserve, roughly how many eggs are left, rather than a direct count. It says nothing about the genetic or biological quality of those eggs, which is influenced far more by age than by AMH itself. A 35-year-old and a 25-year-old with the same AMH level do not have the same egg quality, and therefore not the same odds of a healthy pregnancy.
AMH also does not tell you whether you will ovulate this month, whether your fallopian tubes are open, or whether a partner's sperm is normal, all of which matter just as much for natural conception. It is best understood as one useful piece of a bigger picture, most valuable for planning ahead, especially around IVF timing, rather than as a monthly fertility test.
Typical AMH Ranges by Age
AMH falls, on average, from the mid-twenties onward, with the pace of decline usually picking up from the mid-thirties. These bands describe general patterns seen across large groups of women. They are not a personal forecast, laboratories use different assays and reference ranges, and the range printed on your own report should always be used first. The approximate conversion is 1 ng/mL is roughly 7.1 pmol/L.
| Age | Typical AMH (pmol/L) | Approx. (ng/mL) | Note |
|---|---|---|---|
| 18 to 24 | 15 to 50 pmol/L | 2.1 to 7.0 ng/mL | Reserve is typically at or near its lifetime peak. |
| 25 to 29 | 15 to 48 pmol/L | 2.1 to 6.8 ng/mL | Still generally strong for future planning. |
| 30 to 34 | 10 to 40 pmol/L | 1.4 to 5.6 ng/mL | Gradual decline usually becomes measurable. |
| 35 to 37 | 8 to 32 pmol/L | 1.1 to 4.5 ng/mL | Decline typically speeds up from the mid-thirties. |
| 38 to 40 | 5 to 25 pmol/L | 0.7 to 3.5 ng/mL | A common point where specialists suggest earlier planning conversations. |
| 41 to 42 | 2 to 15 pmol/L | 0.3 to 2.1 ng/mL | IVF egg yield is typically lower and more variable between individuals. |
| 43 to 45 | 1 to 8 pmol/L | 0.1 to 1.1 ng/mL | Levels this low are common as reserve naturally winds down. |
| 46 and over | Often under 3 pmol/L, sometimes undetectable | Often under 0.4 ng/mL | Usually within or approaching the menopause transition. |
Causes of a Low AMH
Causes are grouped as expected, meaning ordinary age-related decline, or other, meaning something beyond typical ageing that is usually worth discussing with your doctor.
Normal ovarian ageing
By far the most common reason for a low AMH. Levels fall gradually on average from the mid-twenties, and the pace of decline usually picks up from the mid-thirties onward. This happens to every woman and is not, by itself, a sign of a problem.
Primary ovarian insufficiency (early menopause)
The ovaries stop working normally before age 40. Usually comes with irregular or absent periods and menopause-like symptoms. Affects a small minority of women and needs prompt assessment when suspected.
Previous ovarian surgery
Removal of an ovarian cyst, including an endometrioma, or removal of an ovary itself, reduces the remaining egg supply, sometimes by more than the amount of tissue removed would suggest.
Chemotherapy or pelvic radiotherapy
Many cancer treatments are toxic to egg cells. AMH often falls sharply during treatment and may only partly recover afterward, depending on the specific drugs, doses and your age at treatment.
Regular smoking
One of the few lifestyle factors with consistent evidence of speeding up egg loss. Quitting will not restore reserve already lost, but may help slow further decline.
Autoimmune conditions affecting the ovary
Autoimmune oophoritis, and sometimes autoimmune thyroid or adrenal disease, can damage ovarian tissue directly and lower AMH over time.
Genetic conditions
Turner syndrome and carrying the Fragile X premutation are both linked to reduced ovarian reserve. Usually only considered when reserve is unexpectedly low at a young age with no other clear explanation.
Recent hormonal contraceptive use
The combined pill and some other hormonal methods can temporarily lower a measured AMH result, often by roughly a fifth to a third. This is a testing effect on the number, not a true loss of eggs, and it usually settles within a few months of stopping.
What Low AMH Does Not Mean
A low result can feel alarming, and a lot of what circulates about AMH online overstates what it can tell you. Here is what the evidence actually supports.
Myth: Low AMH means I cannot get pregnant naturally.
Reality: AMH reflects how many eggs are left, not whether the eggs you do have can fertilise and develop normally. Natural conception also depends on ovulation, tube health and sperm quality. Many people with a low AMH conceive without any fertility treatment, particularly while still young.
Myth: Low AMH means early menopause is about to happen.
Reality: AMH trends downward for years before menopause, so one low result does not pinpoint the year your periods will stop. It becomes more meaningful for menopause timing only when combined with irregular cycles and other symptoms.
Myth: One low result is the final word.
Reality: AMH results can vary slightly between laboratories and testing methods, and recent hormonal contraception temporarily lowers the number. An unexpectedly low reading, especially under age 35, is usually worth confirming before drawing firm conclusions.
Myth: A supplement, diet or detox can raise AMH back up.
Reality: No supplement, diet or cleanse has been shown to reliably increase the number of eggs you have left. Be cautious of products marketed as fertility boosters that claim otherwise. Some modifiable factors, such as quitting smoking, may help slow further decline, but none can add eggs back.
Myth: AMH tells you your exact chance of a live birth.
Reality: AMH mainly predicts how your ovaries are likely to respond to IVF stimulation medication, meaning roughly how many eggs a cycle might collect. It is not your overall chance of a baby. Age remains the strongest single predictor of a successful pregnancy, with or without IVF.
Red Flags, When to See Your GP Promptly
Most people with a low AMH can raise it at their next routine appointment. A few combinations of findings are worth a phone call to your GP sooner:
Periods stop, or become irregular, before age 40
Can be an early sign of primary ovarian insufficiency. Worth discussing with your GP within a few weeks rather than waiting for a routine check-up.
Hot flashes, night sweats or vaginal dryness before age 40
Typical menopause symptoms that, combined with a low AMH, suggest the ovaries may be winding down earlier than usual.
A mother or sister who reached menopause before 45
Early menopause can run in families. Mention this history to your GP, especially alongside a low AMH result.
You are under 35, your AMH is very low or undetectable, and you want children
Worth an earlier conversation with a fertility specialist so you understand your options while you still have the most time to use them.
Low AMH plus unexplained fatigue, weight change or skin changes
Can occasionally point to a coexisting thyroid or adrenal autoimmune condition. Your GP can arrange the relevant blood tests to check.
What Happens Next, The Workup
If your AMH comes back low, especially unexpectedly, your GP or fertility specialist will usually work through a fairly standard sequence to understand why and what it means for your plans.
Confirm the result
If a level is unexpectedly low, especially under age 35, your GP or fertility specialist will often repeat the test and ask whether you were using hormonal contraception at the time, since this can temporarily lower the reading.
Day 2 to 5 FSH and estradiol
Measured early in the menstrual cycle, these give a second view of ovarian reserve and help tell normal ageing apart from other causes.
Antral follicle count on ultrasound
A transvaginal ultrasound counts the small follicles visible in each ovary at the start of the cycle. Used together with AMH, it gives a fuller picture of ovarian reserve than either test alone.
Review medications and cycle history
Your doctor will ask about hormonal contraception, recent pregnancy or breastfeeding, and any previous ovarian surgery or cancer treatment, all of which can affect an AMH result.
Screen for early ovarian insufficiency if under 40
If periods have become irregular or stopped, further tests, and sometimes genetic or autoimmune screening, are used to look for primary ovarian insufficiency.
Talk through your family planning timeline
Whether you are trying to conceive now, planning to later, or still deciding, this is the point where a GP or fertility specialist explains what your result means for your specific plans.
Referral to a fertility specialist
Usually recommended if you are trying to conceive and have not succeeded, if you are considering egg freezing, or if your result is very low for your age.
Your Options, Fertility Planning With a Low AMH
Trying to conceive now
A low AMH does not rule out natural conception, but it usually means timing matters more than it would for someone with a higher reserve. If you have been trying for six months without success, and especially if you are over 35, it is reasonable to see a fertility specialist sooner rather than waiting the standard twelve months, so you can weigh up options like ovulation tracking, medicated cycles or IVF while you still have the most choices available.
Not ready to conceive yet
If children are part of your future but not now, a low AMH is a reasonable prompt to discuss egg freezing with a fertility specialist. Success from frozen eggs depends far more on your age at freezing than on your AMH number alone, so this conversation is usually about timing and expectations rather than urgency alone.
Considering IVF
AMH is one of the main tests used to plan an IVF stimulation protocol, helping predict roughly how many eggs a cycle is likely to collect and how strong a dose of medication may be needed. A lower AMH generally means a lower expected egg yield per cycle, which is why some specialists suggest starting sooner or planning for the possibility of more than one cycle.
Factors within your control
Quitting smoking is the one lifestyle change with consistent evidence of protecting remaining reserve, even though it cannot restore what has already been lost. Maintaining a healthy weight supports overall reproductive hormone balance. Vitamin D deficiency has been studied as a possible factor in ovarian reserve, but the evidence is mixed and it is not a proven way to raise AMH, it is reasonable to ask your GP to check your level and correct a deficiency if found, for your general health regardless.
Looking after yourself while you decide
A low AMH result can bring up real worry, even when the medical picture is reassuring. It is a common finding, most people with a low result have more options than they first assume, and a fertility counsellor or your GP can help you work through the decision without pressure to choose immediately.
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.
Low AMH, Frequently Asked Questions
What does a low AMH level mean?
A low AMH (anti-Mullerian hormone) level means the small follicles in your ovaries, which contain your remaining eggs, are producing less of this hormone than typical for your age. It is a marker of egg quantity, not egg quality, and it does not directly measure your chance of falling pregnant naturally this month. It matters most when planning IVF, because it helps predict how many eggs a stimulation cycle might collect.
What is a normal AMH level for my age in Australia?
AMH declines gradually with age, so what counts as typical falls the older you are. As a rough guide, women in their late twenties often sit somewhere between 15 and 48 pmol/L, while women in their early forties often sit between 2 and 15 pmol/L. These are indicative bands, not personal targets. Laboratories use different assays and reference ranges, so always compare your result to the range printed on your own report.
Can I still get pregnant naturally with a low AMH?
Often, yes. AMH reflects how many eggs remain, not whether the eggs you have can fertilise and develop normally, and it is not a direct measure of your monthly chance of conceiving. Natural conception also depends on ovulation, the fallopian tubes and sperm quality. Many people with a low AMH conceive without fertility treatment, particularly while still relatively young.
Does low AMH mean I am going through early menopause?
Not on its own. AMH trends downward for many years before menopause, so a single low result does not predict the exact year your periods will stop. It becomes more relevant to early menopause when it appears together with irregular or absent periods, hot flashes, or other menopause-like symptoms before the age of 40, which is worth discussing with your GP.
Can a low AMH level go back up?
Usually not by much, since AMH mostly reflects the number of eggs you have left, and that number only ever falls over a lifetime. The main exception is a temporary dip caused by recent hormonal contraceptive use, which typically corrects itself within a few months of stopping. No supplement or diet has been shown to reliably raise true ovarian reserve.
Does the contraceptive pill affect AMH test results?
Yes, the combined pill and some other hormonal contraceptives can temporarily lower a measured AMH result, often by roughly a fifth to a third. This is a testing effect rather than a true loss of eggs, and levels generally settle back within a few months of stopping. Tell your doctor if you were on hormonal contraception when the sample was taken.
What counts as a very low AMH level?
There is no single universal cutoff, because what is low depends heavily on your age. As a general guide, many fertility specialists pay closer attention when AMH falls below roughly 7 to 8 pmol/L (about 1 ng/mL) regardless of age, and especially when a result is well below the typical band for someone your age. Your own doctor will interpret your number against your age and your fertility goals.
Does it matter what day of my cycle I have the AMH test done?
Not much. Unlike FSH, which needs to be measured early in the cycle, AMH stays fairly stable across the menstrual cycle, so it can usually be tested on any day. The main things that do affect the result are recent hormonal contraceptive use, pregnancy, and breastfeeding, so mention any of these to whoever orders the test.
Related Reading
Got Your Hormone Panel Results?
Upload your pathology report and SmarterBlood's AI will explain every marker, including AMH, FSH and estradiol, in plain English, with Australian reference ranges and a graph of how your results change over time.
This page provides general educational information about low AMH and ovarian reserve. It is not a substitute for professional medical advice, diagnosis or treatment, and it is not affiliated with any pathology laboratory or fertility clinic. Always consult your GP or a fertility specialist about your own results, they have access to your full history and can interpret your results in context. SmarterBlood does not provide medical care and does not order tests.