AMH Levels and Fertility: Understanding Your Ovarian Reserve

Anti-Müllerian hormone (AMH) is a blood-test marker of how many eggs are left in your ovaries — your ovarian reserve. It estimates egg quantity, not egg quality, and current guidelines say it should not be used on its own to predict your chances of conceiving naturally.

If you have just had your AMH tested, or you are weighing whether to ask for the test, the result can feel like a number with too much power. We want to give it back its right size. This guide walks through what AMH actually measures, what the numbers mean at each age, what is now known about the limits of AMH as a fertility test, and how to interpret a result you weren't expecting — without losing perspective on everything else that matters.

What is AMH and what does it actually measure?

AMH is a glycoprotein hormone produced by the granulosa cells surrounding small, growing follicles in your ovaries. Because each remaining follicle contributes a tiny amount of AMH, a blood measurement gives an approximate count of how many follicles are currently in the growing pool — and by extension, an estimate of your overall ovarian reserve.³

That distinction matters. AMH is a quantity signal. It tells you roughly how many eggs you have left in the pipeline. It does not tell you how genetically normal those eggs are, how well they will fertilise, or how likely they are to produce a healthy pregnancy. Those are questions about quality, and AMH cannot answer them.³

Unlike FSH or oestradiol, AMH stays relatively stable across your menstrual cycle, which is why it can be measured on any day. That convenience is part of why it has become the most commonly ordered ovarian reserve test in fertility clinics worldwide.³

What are normal AMH levels by age?

AMH peaks in the mid-twenties and then declines roughly linearly with age. By the late thirties most women are below 1.5 ng/mL, and by the early forties the typical value sits closer to 0.5-1.0 ng/mL.^3,4 This age-related fall mirrors the steady depletion of the primordial follicle pool that started before you were born.³

There is no single internationally agreed cut-off for "low," "normal" or "high" AMH, because reference ranges vary by laboratory assay, ethnicity, and clinical context. The figures below show typical average ranges reported in the published literature and used by major fertility clinics — they are a guide, not a verdict.^3,4

A few notes on reading the table. First, individual variation within each age band is large — two healthy 35-year-olds can easily have AMH values of 0.8 and 2.8 ng/mL and both be conceiving normally. Second, an AMH "for your age" matters more than an AMH against a universal benchmark — a 1.0 ng/mL at age 40 looks different from a 1.0 ng/mL at age 30. Third, no single AMH value defines infertility on its own.^1,3

Does a low AMH mean I cannot get pregnant naturally?

No — and this is the most important misunderstanding in the entire AMH conversation. The largest and best-designed study to date directly testing this question is Steiner and colleagues' 2017 JAMA paper, which followed 981 women aged 30-44 without a history of infertility who had been trying to conceive for three months or less. Women with biomarkers of diminished ovarian reserve (low AMH or high FSH) were no less likely to conceive within six or twelve cycles than women with normal markers.¹

A 2024 study in Archives of Gynecology and Obstetrics reached the same conclusion in a different group of women: ovarian reserve markers (including AMH) did not differ between women with unexplained infertility and women whose partners had male-factor issues, and low AMH did not influence the chance of natural conception.²

In 2025, the journal Fertility and Sterility published an editorial titled "Do not measure antimüllerian hormone to predict women's fecundity" — its conclusion was direct: AMH levels do not influence time to spontaneous conception, and using AMH this way leads to inappropriate counselling.⁵

The 2020 ASRM Committee Opinion on ovarian reserve testing puts this in clinical language: ovarian reserve tests are "good predictors of oocyte yield" in IVF "but poor independent predictors of reproductive potential, and therefore should not be used as a fertility test or to deny access to infertility treatment".⁴

Why does AMH measure quantity but not quality?

AMH is produced by follicles that have already started growing. The more growing follicles you have, the more AMH appears in your blood. So AMH counts what is in your follicle pool, but it does not measure what is inside each egg — its chromosomal integrity, its mitochondrial energy, its developmental competence.³

Egg quality declines with age for separate reasons, mostly related to the gradual accumulation of meiotic errors and the slow loss of mitochondrial function inside each oocyte. A 2014 analysis of 15,169 trophectoderm biopsies showed that aneuploidy rates follow a U-shaped pattern with maternal age — they are lowest in the late twenties (roughly one in four embryos affected) and climb steeply from there, reaching around 40% at age 35, around 60% at age 40, and over 80% by age 43.⁷

That separation is important. AMH and aneuploidy both decline with age, but they do so through different biology. You can be in your late thirties with an AMH of 0.7 ng/mL and still produce a chromosomally normal egg that becomes a healthy pregnancy — because the question of whether you ovulate a euploid egg this cycle does not depend on the size of your remaining follicle pool.^1,5,7

What does an AMH test actually tell you?

In a fertility clinic setting, AMH is genuinely useful for two specific decisions: planning the dose of ovarian-stimulation medication for IVF, and counselling about likely response (poor, normal, or hyper-responder).^3,4 Outside the IVF setting it has narrower applications.^4,5

A 2014 review in Human Reproduction Update confirmed that both AMH and antral follicle count (AFC) reliably predict ovarian response to stimulation but do not, by themselves, predict whether a pregnancy will result.³ If you are deciding whether to consider egg freezing or beginning IVF, AMH adds useful information. If you are trying naturally and otherwise healthy, AMH is more often a source of anxiety than a clinically actionable number.^4,5

There are a handful of specific situations where AMH is genuinely informative for non-IVF decisions: investigating premature ovarian insufficiency (very low AMH alongside elevated FSH and missed periods), supporting a PCOS diagnosis where ultrasound is unclear (elevated AMH), and predicting menopausal timing in research contexts (still imprecise at the individual level).^4,8

How does AMH appear in PCOS?

In polycystic ovary syndrome, AMH tends to be elevated — sometimes two to three times the typical age-band value — because women with PCOS carry an unusually large pool of small antral follicles, and each follicle contributes AMH.⁸ The 2023 International Evidence-Based Guideline for PCOS now lists elevated AMH as an acceptable alternative to ultrasound for confirming polycystic ovarian morphology, one of the three Rotterdam criteria. The guideline explicitly declined to recommend a universal cut-off because different commercial assays produce different absolute values; separate validation studies on widely used assays such as the Roche Elecsys have proposed practical thresholds in the region of 3.2 ng/mL. Either way, AMH alone is not sufficient — it must be combined with at least one of the other Rotterdam criteria.⁸

Here's where many people get confused: a high AMH in the context of PCOS is not a sign of better fertility. PCOS often involves ovulatory dysfunction, insulin resistance, and an inflammatory environment that can complicate conception, even though the egg pool itself is large.⁸ If you have PCOS and an elevated AMH, the number reflects the size of your antral follicle pool — it does not mean you are more fertile than someone with a "normal" AMH.

What can artificially raise or lower an AMH measurement?

Several factors can shift an AMH reading independent of true ovarian reserve, and they matter when you are interpreting your result.

Hormonal contraception is the largest of these. A 2023 population study of 42,684 women in Fertility and Sterility found that current users of combined oral contraceptives, the vaginal ring, the contraceptive implant, and hormonal IUDs all had significantly lower mean AMH values than non-users, with combined pills and the ring producing the largest measured reductions. The effect was strongest in long-term users, and AMH values typically rebound toward baseline after stopping hormonal contraception.⁶ If you have just come off the pill and tested AMH within a few months, your number is almost certainly an undercount of your true reserve.

Other influences include: time of measurement (AMH is more stable than other reproductive hormones but can still vary modestly across the cycle), recent ovarian surgery (which can lower AMH by removing follicle-containing tissue), and laboratory assay differences (different commercial AMH assays give different absolute values).^3,4

Comparing the main ovarian reserve tests

Three tests are commonly used together or interchangeably to assess ovarian reserve. They measure related things but are not equivalent.

The 2020 ASRM committee opinion recommends that any single test be interpreted in the context of the full clinical picture — age, prior pregnancy history, cycle regularity, and the time you have been trying.⁴

What should I do if my AMH came back low?

A low AMH result is one of the more frightening numbers in fertility testing — and most of the fear comes from how it is communicated rather than what it actually means. Here is a calmer framework.

First, give the number context. If you are under 35, have regular cycles, and have been trying for less than six months, a low AMH on its own is not a reason to change your plan.^1,4,5 If you are 35 or older with irregular cycles or more than six months of trying without success, it is information that may justify a fertility evaluation. For more on the conversation about age, AMH, and natural conception, see our guide on trying to conceive at 35+.¹⁰

Second, separate quantity from quality. A low AMH tells you the pool is smaller. It does not tell you that this month's ovulated egg is abnormal.^3,7

Third, think about what you can support. The egg quality literature suggests that some lifestyle and nutritional factors are associated with better reproductive outcomes regardless of ovarian reserve status — covered in depth in our review of the top fertility supplements and in our practical guide to fertility supplements for women over 35. CoQ10 supplementation has been studied specifically in women with diminished ovarian reserve undergoing IVF; a 2024 meta-analysis of six randomised trials (n=1,529) found that pretreatment with 200-600 mg per day was associated with more retrieved oocytes, higher clinical pregnancy rates, and reduced cycle cancellations.¹¹ Vitamin D sufficiency is associated with better assisted reproduction outcomes in a 2018 meta-analysis of 11 cohort studies (n=2,700; OR 1.33, 95% CI 1.08-1.65 for live birth in replete vs deficient women).¹² Omega-3 supplement use was associated with a fecundability ratio of 1.51 (95% CI 1.12-2.04) in a 2022 prospective cohort study of 900 women aged 30-44.⁹

For broader lifestyle and nutritional context that applies to anyone working on how to improve egg quality naturally, our pillar article covers the full evidence base, including sleep, diet pattern, oxidative stress, and the mitochondrial mechanism behind age-related egg quality changes.

A practical note on the supplements above: it is worth discussing any new supplement with your GP or fertility specialist before starting, particularly if you are taking anticoagulants (CoQ10 and high-dose omega-3 can both affect bleeding parameters), already supplementing vitamin D from another source, or pregnant. Doses, brands, and form (for example ubiquinol vs ubiquinone, or D3 vs D2) can also be worth a brief conversation rather than guesswork.

Fourth, talk to a specialist if you are 35 or older or have been trying for over a year (over six months if 35+). NICE guideline NG257 (March 2026) recommends earlier referral for women aged 36 and over.¹⁰

How does AMH change after fertility treatments and surgery?

Procedures that remove or damage ovarian tissue can lower measured AMH. Endometrioma surgery (particularly cystectomy), ovarian drilling for PCOS, and any surgery requiring removal of part of an ovary can reduce AMH proportionally to the tissue affected.⁴ Chemotherapy and pelvic radiation can also reduce AMH significantly, with the size of the effect depending on the regimen and the woman's pre-treatment reserve.⁴

Here's some reassurance: a single elevated FSH or low AMH measurement after such a procedure does not necessarily mean menopause is near, even though it does indicate that follicle numbers are now lower than they were before. If you are considering fertility-preserving options (such as egg freezing) before treatment, AMH testing alongside an antral follicle count is a reasonable input to that conversation.^3,4

Supporting Your Fertility with FertilitySmart

Whatever your AMH result is telling you, the practical question is how to support the eggs you have. Nutrients such as CoQ10, folate, vitamin D, and omega-3 fatty acids play documented roles in oocyte and overall reproductive health, particularly in women with diminished ovarian reserve.^9,11,12

At FertilitySmart, we offer both fertility supplements for women and fertility supplements for men formulated with CoQ10, folic acid, vitamin D, vitamin E, zinc, and other evidence-supported nutrients discussed in this guide. Explore our range of evidence-based fertility supplements formulated with the nutrients most relevant to ovarian and reproductive health.

Marina Carter

Health & Fertility Writer at FertilitySmart

Marina Carter is FertilitySmart's lead writer on fertility, preconception health, and reproductive nutrition. She translates the clinical and nutritional evidence base into honest, practical guidance for individuals and couples trying to conceive, working closely with the product team to ensure every article reflects current peer-reviewed research and the lived emotional reality of the fertility journey. Read Full Bio →