AMH and fertility: what your level really means
What the AMH test measures, how to read your own number, why the pill lowers it, and why a low result says less about conceiving than you have been told.
Written and evidence-checked by the VeriNourish Editorial Team against 12 named sources listed below. No licensed clinician reviews this content.
If you are holding an AMH result and the number looks low, here is the short answer: it does not tell you whether you can get pregnant. AMH estimates how many eggs are left. It says nothing about how good they are, and those are not the same thing.
That distinction is the whole article. AMH is genuinely useful inside a fertility clinic, where it helps predict how your ovaries will respond to stimulation. It is much weaker as a standalone check on your fertility, and the bodies that write the guidelines say so in plain language.
What AMH actually measures
AMH is made by cells inside the small follicles of your ovaries. Follicles are the fluid-filled sacs that hold your eggs. The more small follicles you have, the more AMH you make, so the level works as a rough marker of the size of the pool rather than an exact count of the eggs in it. That pool shrinks with age, so AMH drifts down over time.
One practical advantage over other hormones: ASRM says AMH can be measured at any point in your cycle, with no need to time the appointment to a particular day (ASRM, 2021). Other hormones drawn at the same appointment, such as FSH, may still need a specific day.
Reading your own result
Two things trip people up before interpretation has even started.
The units. Results arrive in either ng/mL or pmol/L, and the two look nothing alike. Multiply ng/mL by about 7.14 to convert: 2 ng/mL is the same measurement as 14.3 pmol/L (Cureus, 2022). A result of "2" and a result of "14" can be identical. Check which unit your lab used before you compare yourself with anything you read online.
Your age. There is no universal normal, because the expected range slides down every year. Cleveland Clinic puts the lower end of the usual range at roughly 3.0 ng/mL at 25, 2.5 at 30, 1.5 at 35, 1.0 at 40 and 0.5 at 45, and describes under 1.0 ng/mL as low in general terms (Cleveland Clinic). The same 1.2 means different things at 27 and at 40.
Labs also run different assays and scales, so a number from one clinic is not directly comparable with a number from another.
Placing your own result
The number on its own means little. The number next to your situation means a good deal more.
| Your result for your age | Your situation | What it most likely means |
|---|---|---|
| Low | Regular cycles, not trying to conceive yet | Very little practical information. Your age tells you more. |
| Low | Trying for a year or more | A reason for a full assessment, not a verdict on its own |
| Low | Tested while on the combined pill | Read it with that in mind. If a fertility clinic needs a cleaner reading, ask how to plan a break from contraception safely |
| High | Irregular or absent cycles | Points toward PCOS. In adults AMH can stand in for an ultrasound of the ovaries, and with signs of high androgens as well, neither test is needed |
| Normal | Trying for a year or more | A normal AMH does not rule out a fertility problem |
The pattern across every row: AMH changes what a doctor does next, not whether you are fertile.
What high and low results mean
- Higher AMH suggests a larger pool of small follicles
- Lower AMH suggests a smaller one
Lower levels are expected as you approach menopause, and AMH is one of the markers that shifts through perimenopause. A high AMH often turns up in PCOS, where the ovaries carry many small follicles (Diagnostics, 2023). There, a high number points toward the condition rather than toward unusually good fertility. The condition was renamed polyendocrine metabolic ovarian syndrome (PMOS) in 2026, so you may see either name. The 2023 international guideline says AMH can be used to judge whether the ovaries look polycystic in adults, as an alternative to an ultrasound rather than in addition to one, but not as a single test for the diagnosis and not yet in teenagers. With irregular cycles and signs of high androgens, neither AMH nor an ultrasound is needed (Human Reproduction, 2023).
What a low AMH does not mean
This is where a misread test does the most damage.
A well-known JAMA study followed 750 women aged 30 to 44 who were trying to conceive and had no history of infertility. Those with a low AMH, under 0.7 ng/mL, conceived at much the same rate as those with normal levels: 65 percent against 62 percent within six cycles, and 84 percent against 75 percent within twelve. The authors concluded that markers of diminished ovarian reserve were not associated with reduced fertility in this group (JAMA, 2017).
A larger study adds some nuance. Among 3,150 US women who had been trying for less than three months, an AMH below 1 ng/mL went with a modestly lower chance of conceiving in each cycle (adjusted hazard ratio 0.77). Conception was self-reported from a positive pregnancy test, the women had all bought a Modern Fertility hormone test, and several authors work for or own stock in that company (Fertility and Sterility, 2024). Taken together, the two studies say a low AMH shifts the odds modestly at most. ACOG's position is that a single AMH level is not useful for predicting time to pregnancy in women without a diagnosis of infertility (ACOG, 2019).
Worth rereading if your own result came back low. In a woman who has not been diagnosed with infertility, a low number says very little about her chances this year.
The reason is the split between quantity and quality. AMH counts follicles. Whether an egg fertilizes and develops normally depends on its chromosomes, and no blood test measures that. Age stays the better proxy for egg quality, which is why a 30-year-old with a low AMH and a 42-year-old with a normal one are in different positions regardless of what the two numbers suggest.
Two things AMH is often expected to do, and does not
Predict your menopause. A low result at 38 does not mean menopause at 45. AMH does fall as the ovarian reserve shrinks, so it moves in the right direction, but moving in the right direction is not the same as forecasting a date. Reviews still describe that use as unsettled (Cureus, 2022), Cleveland Clinic states outright that the test does not predict when you will go through menopause (Cleveland Clinic), and ACOG calls using AMH to predict the onset of menopause unsuitable for clinical practice (ACOG, 2019). If what you want to know is whether your cycles are changing, our perimenopause guide is the more useful place to start, because symptoms and cycle pattern carry more information here than this hormone does.
Tell you whether you are pregnant. AMH is not a pregnancy test and has nothing to do with detecting one. It is measured from the same blood draw as several fertility hormones, which is where the confusion comes from. Nor does it change meaningfully with a pregnancy in progress in a way that tells you anything useful.
What moves the number besides your ovaries
Hormonal contraception lowers it. This is the most common avoidable confounder, and most women testing privately are never warned. In a population study of 42,684 women, combined pill users had AMH about 17 percent lower than non-users, and the gap was widest at the bottom of the range: 32 percent lower at the 10th percentile, 19 percent at the median, 5 percent at the 90th. A hormonal IUD showed no effect in that study (Fertility and Sterility, 2023), while an earlier analysis of 27,125 women found it about 7 percent lower (AJOG, 2021). Both drew on women who bought the same commercial test and compared groups at one point in time, so neither shows the contraceptive caused the difference. If you tested on the combined pill and landed on a borderline-low result, that result is not clean.
Do not stop contraception just to retest if you do not want to be pregnant. When a fertility clinic needs a more accurate picture of your ovarian reserve, ASRM says stopping hormonal contraception for 2 to 3 months may allow one (ASRM, 2024), and that is a plan to make with the clinic, including what you use instead.
The same study makes the honest point in the other direction: these contraceptive differences are small next to the natural variation between women of the same age. It is a reason to interpret carefully, not a reason to panic and not a reason to dismiss the test.
Your cycle moves it a little. AMH was long described as cycle-independent. Newer work finds real within-cycle variation (Cureus, 2022). It does not change the advice that the test can be done on any day, but if a borderline result would change a decision, ask whether repeating it is worth doing first.
Where AMH earns its place
- Planning fertility treatment. It predicts how your ovaries will respond to stimulation in IVF, which guides drug doses and flags the risk of overstimulation (Cureus, 2022).
- Investigating PCOS in adults, where it can be used instead of an ultrasound to judge the ovaries, alongside your cycle history.
- Before treatment that can damage the ovaries, such as some cancer therapies, where the starting point matters.
- Not as part of a bigger panel for its own sake. An antral follicle count on ultrasound, FSH and estrogen are sometimes measured too, but ASRM notes that combining ovarian reserve markers has not predicted response better than the individual tests. It also says an extremely low AMH should not be used on its own to refuse IVF (ASRM, 2020).
In each of these the test informs a decision already being made. That is a different job from ordering it to find out whether you are fertile.
Should you test if you are not trying to conceive?
Usually not, and this is the clearest guidance in the whole area.
The American Society for Reproductive Medicine states that markers of ovarian reserve "should not be used as a fertility test for women who are not infertile or who have untested fertility," and that they "should not be used to promote planned oocyte cryopreservation." Decisions about egg freezing, it says, belong with your reproductive plans and your age (ASRM, 2020).
That guidance matters because home AMH kits are sold on exactly the promise it rejects: a number that tells you where you stand. A low result from one of those tests, read without an ultrasound, without your cycle history and often while you are on the pill, mostly buys anxiety.
If the question underneath is "should I be doing something about this now," then your age, your cycle history and how long you have been trying will answer it better than one hormone.
When to see a doctor
Speak to a doctor or a fertility specialist if you have been trying to conceive for a year without success, or six months if you are 35 or older, and sooner than that over 40 (ASRM, 2021); if you are weighing egg freezing or IVF; if your cycles are irregular or have stopped; or if you have signs of PCOS or endometriosis.
Take the result with you rather than acting on it alone, and take two details with it: which unit the lab used, and whether you were on hormonal contraception when the blood was drawn. Both change how the number should be read, and neither is usually printed on the report.
Frequently asked questions
What does AMH measure?
AMH, or anti-Mullerian hormone, is made by cells in the small follicles of your ovaries. Its level is a marker of your ovarian reserve, the size of that pool of follicles, rather than an exact count of the eggs you have left. A higher AMH suggests a larger pool and a lower AMH a smaller one, which is why it falls with age. It says nothing about egg quality.
Does a low AMH mean I cannot get pregnant?
No. A JAMA study of 750 women aged 30 to 44 with no history of infertility found that those with an AMH below 0.7 ng/mL conceived at much the same rate as women with normal levels: 65 percent versus 62 percent within six cycles, and 84 percent versus 75 percent within twelve. A larger 2024 study of 3,150 women found a modestly lower chance of conceiving each cycle below 1 ng/mL, so a low result may shift the odds a little, but it does not tell any one woman she cannot conceive. AMH reflects quantity, not the egg quality that drives a successful pregnancy.
Does the pill affect my AMH result?
Yes, and it is the most common avoidable confounder. In a study of 42,684 women, combined pill users had AMH around 17 percent lower than non-users, with the gap widest at the low end of the range. A hormonal IUD showed no effect in that study, though an earlier analysis found about 7 percent lower. If you tested while on the combined pill and got a borderline result, tell your doctor rather than stopping contraception to retest. ASRM says that when a fertility clinic needs a more accurate reading, stopping hormonal contraception for 2 to 3 months may help.
What is a normal AMH level?
There is no single normal number. The expected range slides down with age, and results come in two units that look completely different: multiply ng/mL by about 7.14 to get pmol/L, so 2 ng/mL and 14.3 pmol/L are the same result. Labs also use different assays, so numbers are not directly comparable between clinics.
Should I get an AMH test if I am not trying to conceive?
Usually not. The American Society for Reproductive Medicine states that markers of ovarian reserve should not be used as a fertility test in women who are not infertile, and should not be used to promote egg freezing. Decisions about egg freezing should rest on your reproductive plans and your age.
Does a low AMH mean early menopause?
It does not predict a date. AMH falls as the ovarian reserve shrinks, so it moves in the right direction, but reviews still describe using it to forecast menopause as unsettled, Cleveland Clinic states plainly that the test does not predict when you will go through menopause, and ACOG calls using AMH to predict the onset of menopause unsuitable for clinical practice. If your cycles are changing, the pattern of those changes tells you more than this hormone does.
Can an AMH test detect pregnancy?
No. AMH is not a pregnancy test and has nothing to do with detecting one. The confusion usually comes from it being measured in the same blood draw as other fertility hormones.
What causes a high AMH?
A high AMH is often seen in polycystic ovary syndrome, renamed polyendocrine metabolic ovarian syndrome (PMOS) in 2026, because the ovaries contain many small follicles. In that context a high level is a clue rather than a sign of especially good fertility. The 2023 international guideline lets AMH stand in for an ultrasound when judging the ovaries in adults, but not diagnose the condition on its own, and not in teenagers.
References
- Association Between Biomarkers of Ovarian Reserve and Infertility Among Older Women of Reproductive Age · JAMA, 2017;318(14):1367-1376
- Testing and interpreting measures of ovarian reserve: a committee opinion · ASRM, Fertility and Sterility 2020;114:1151-7
- Contraceptive-specific antimullerian hormone values in reproductive-age women: a population study of 42,684 women · Fertility and Sterility, 2023
- Antimüllerian hormone levels are associated with time to pregnancy in a cohort study of 3,150 women · Fertility and Sterility, 2024;122(6):1114-1123
- Anti-Müllerian hormone levels among contraceptive users: evidence from a cross-sectional cohort of 27,125 individuals · American Journal of Obstetrics and Gynecology, 2021
- Fertility evaluation of infertile women: a committee opinion · ASRM, 2021
- The use of hormonal contraceptives in fertility treatments: a committee opinion · ASRM, 2024
- Recommendations from the 2023 international evidence-based guideline for the assessment and management of polycystic ovary syndrome · Human Reproduction, 2023
- The use of antimüllerian hormone in women not seeking fertility care · ACOG Committee Opinion 773, 2019
- Anti-Mullerian hormone (AMH) test: purpose, levels and results · Cleveland Clinic
- Anti-Mullerian hormone as a marker of ovarian reserve and function · Cureus, 2022
- Polycystic ovary syndrome: pathophysiology and controversies in diagnosis · Diagnostics (Basel), 2023