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 6 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 count of the eggs still in the pool. That pool shrinks with age, so AMH drifts down over time.
One practical advantage over other hormones: blood can be drawn at any point in your cycle, with no need to time the appointment to a particular 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, or repeat it off the pill |
| High | Irregular or absent cycles | Points toward PCOS. Needs ultrasound and your cycle history |
| 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.
What a low AMH does not mean
This is where a misread test does the most damage.
The largest careful study of the question 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).
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), and Cleveland Clinic states outright that the test does not predict when you will go through menopause (Cleveland Clinic). 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 at all (Fertility and Sterility, 2023). If you tested on the combined pill and landed on a borderline-low result, that result is not clean.
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, enough that one borderline reading deserves a repeat rather than a decision (Cureus, 2022).
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, alongside ultrasound and your cycle history.
- Before treatment that can damage the ovaries, such as some cancer therapies, where the starting point matters.
- As one input among several. An antral follicle count on ultrasound, FSH and estrogen together tell you more than any single result.
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 over 35; 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 reflects your ovarian reserve, roughly how many eggs you have left. A higher AMH suggests more, a lower AMH suggests fewer, which is why it falls with age.
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. AMH counts eggs; it does not measure their quality, and quality is what 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. If you tested while on the combined pill and got a borderline result, tell your doctor, because the number is not a clean reading.
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, and Cleveland Clinic states plainly that the test does not predict when you will go through menopause. 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, because the ovaries contain many small follicles. In that context a high level is a clue toward PCOS rather than a sign of especially good fertility.
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
- 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