Anti-Müllerian hormone (AMH) is a hormone produced by small follicles in the ovaries, and a blood test measuring it is used as one marker of how many eggs a woman has remaining. It is not a direct measure of egg quality, and it does not predict whether you can get pregnant naturally. AMH is one piece of information among several — age, menstrual history, and other tests matter just as much.
What Is AMH And What Does It Mean For Fertility?
AMH is made by the granulosa cells inside small ovarian follicles — the fluid-filled sacs where eggs mature. These small follicles are called antral follicles, and they are the pool from which one egg is typically selected each cycle.
Because each small follicle produces AMH, the amount in your blood roughly reflects how many small follicles are present. A higher level generally means more follicles. A lower level generally means fewer. That is the core of what the test measures.
The important distinction: AMH tells you about ovarian reserve — the size of the egg pool — not about the health or genetic quality of any individual egg. A woman with low AMH can still conceive naturally. A woman with high AMH can still struggle. These are related but separate things, and conflating them is one of the most common misunderstandings about this test.
How Is AMH Different From Other Fertility Tests?
AMH has one practical advantage over most other fertility markers: it can be measured on any day of the menstrual cycle. Levels stay relatively stable across the cycle, unlike hormones such as FSH (follicle-stimulating hormone) or estradiol, which rise and fall with each phase.
FSH is typically measured on day 2 or 3 of the cycle because that is when it is most informative. AMH does not carry that timing requirement, which makes it convenient.
AMH also tends to decline gradually with age rather than in sharp jumps, which is why it is sometimes used to track ovarian reserve over time. That said, the decline is not perfectly linear, and a single reading at one point in time is a snapshot, not a forecast.
Another point worth understanding: AMH is not the same as antral follicle count (AFC), though the two are related. AFC is measured by ultrasound and counts the small follicles visible on the ovaries. Both AMH and AFC estimate ovarian reserve, and clinicians often look at both together rather than relying on either alone.
What Do High And Low AMH Levels Mean?
There are no universal cutoffs that apply to every woman, because normal ranges vary by age and by the laboratory performing the test. Different labs use different assays, and results are not always directly comparable between them.
Broadly, here is what the ranges tend to indicate:
- Higher AMH generally suggests a larger ovarian reserve. It can also be seen in polycystic ovary syndrome (PCOS), where many small follicles are present but do not mature normally. High AMH does not automatically mean better fertility.
- Lower AMH generally suggests a smaller ovarian reserve. It becomes more common with age. It does not mean pregnancy is impossible.
- Very low AMH may indicate diminished ovarian reserve, which can affect response to fertility treatment. It is a conversation to have with a clinician, not a diagnosis on its own.
One clarification that surprises many people: a low AMH does not mean you are in menopause or approaching it imminently. Some women with low AMH still ovulate regularly and conceive without assistance. The test estimates quantity, not function.
Does AMH Predict Whether You Can Get Pregnant?
No. AMH does not predict natural fertility or the ability to conceive without help. This is one of the clearest findings in reproductive medicine.
Studies have consistently found that AMH is a poor predictor of spontaneous pregnancy in women trying to conceive on their own. A low AMH does not mean you cannot get pregnant. A normal or high AMH does not guarantee you will.
Where AMH is more useful is in predicting how the ovaries might respond to fertility treatment — specifically to injectable hormones used in IVF. Women with lower AMH tend to produce fewer eggs during stimulation. Women with higher AMH tend to produce more, and in some cases face a higher risk of ovarian hyperstimulation syndrome (OHSS), a complication of fertility treatment.
AMH is also used in some settings to help estimate the timing of menopause, though its predictive accuracy for an individual woman is limited. It gives a general sense of ovarian aging, not a precise date.
What Causes AMH To Be Low Or High?
Age is the single biggest factor. AMH peaks in the mid-twenties and declines gradually through the thirties and forties. This decline is a normal part of reproductive aging, not a sign of anything wrong.
Other factors that can affect AMH include:
- Ovarian surgery, which can reduce the number of follicles
- Chemotherapy or radiation, which can damage ovarian tissue
- Certain genetic conditions affecting the ovaries
- PCOS, which is typically associated with higher AMH
- Smoking, which some research suggests may accelerate the decline in ovarian reserve
AMH can also fluctuate somewhat between tests, and results can vary between laboratories. A single low reading is not always definitive. Clinicians sometimes repeat the test if results seem inconsistent with the clinical picture.
One thing that does not reliably raise AMH: supplements or lifestyle changes marketed to “boost” ovarian reserve. No clinical evidence currently confirms that any supplement increases AMH or restores eggs. Be cautious of products making that claim.
When Should You Consider An AMH Test?
AMH testing is most commonly ordered in the context of fertility evaluation or before starting fertility treatment. It may also be checked in women with suspected PCOS, or in some cases before ovarian surgery or cancer treatment that could affect fertility.
Routine AMH testing in women without symptoms or fertility concerns is not universally recommended. Some clinicians offer it as part of a general fertility assessment; others argue it can cause unnecessary anxiety without changing outcomes. The evidence does not clearly support universal screening.
If you are considering the test, it is worth discussing with a clinician what the result would actually change — whether it would affect a decision about timing, treatment, or next steps. A number without context can be misleading in either direction.
What AMH Does Not Tell You
AMH does not measure egg quality. It does not tell you whether your eggs are chromosomally normal. It does not predict miscarriage risk. It does not tell you whether you will respond to a specific fertility medication. And it does not tell you definitively whether you can or cannot have a baby.
What it does offer is an estimate of ovarian reserve — a rough gauge of how many eggs remain — which can be useful in certain clinical contexts, particularly when planning fertility treatment. That is a narrower and more honest description of what the test is for.
If you receive an AMH result that concerns you, the next step is a conversation with a reproductive endocrinologist or your gynecologist, not a decision made on the number alone.
Frequently Asked Questions
Can I get pregnant naturally with low AMH?
Yes. Low AMH indicates a smaller egg reserve but does not mean you cannot conceive without help. Many women with low AMH ovulate normally and become pregnant naturally.
Does high AMH mean I am more fertile?
Not necessarily. High AMH suggests a larger egg pool, but it is also associated with PCOS, where follicles may not mature normally. AMH does not measure egg quality or guarantee pregnancy.
Can AMH levels be improved?
No clinical evidence currently confirms that any supplement, diet, or lifestyle change can raise AMH or restore ovarian reserve. AMH naturally declines with age and is not considered modifiable in a meaningful way.
When should AMH be tested?
AMH is most often tested as part of a fertility evaluation or before fertility treatment. Routine testing in women without fertility concerns is not universally recommended, so it is worth discussing with a clinician first.
