AMH Blood Test: Anti-Müllerian Hormone & Ovarian Reserve

Anti-Müllerian hormone (AMH) is made by the small follicles inside the ovary. Its level in the blood mirrors your pool of follicles — what clinicians call your ovarian reserve. The AMH blood test is the main blood marker used to estimate that reserve, above all before in vitro fertilization (IVF). But one very common misconception is worth clearing up right away: AMH measures a quantity of follicles, not the quality of your eggs and not your ability to conceive naturally. This guide explains normal AMH levels by age, what a low or high result means, and why low AMH does not mean "I can't get pregnant." AMH is usually ordered as part of a broader hormone panel, alongside FSH, estradiol, and LH.

Key takeaways

• AMH is produced by the granulosa cells of small antral follicles; its level reflects your ovarian reserve (the pool of follicles), not egg "quality."¹
• A typical range in reproductive-age women is ~1.0–4.0 ng/mL (about 7–29 pmol/L); the level is strongly age-dependent and varies widely by assay and lab.¹²
• Low AMH (< ~1 ng/mL) suggests a diminished reserve; high AMH points toward polycystic ovary syndrome (PCOS).²³
• AMH is most useful to predict the ovarian response before IVF (stimulation dose, hyperstimulation risk) and to work up infertility or premature ovarian insufficiency.⁴¹
• ⚠️ A low AMH does not mean you can't get pregnant: it is a poor predictor of natural conception. It is not a consumer fertility test.⁵
• No fasting is required, and the test can be drawn on any day of the cycle — an advantage over FSH.⁶

What is anti-Müllerian hormone?

Anti-Müllerian hormone (AMH) is a protein secreted, in women, by the granulosa cells that surround the small follicles of the ovary (pre-antral and small antral follicles). Every woman is born with a fixed pool of follicles that declines throughout life. Because the amount of AMH produced tracks the number of these small "waiting" follicles, measuring AMH estimates the size of the remaining pool — the ovarian reserve.¹

It helps to separate two ideas that are often blurred together:

• ovarian reserve = the number of follicles still available (a quantity);
• egg quality = the ability of eggs to make a viable embryo, which depends mostly on age.

AMH tells you about the first, not the second. On its own, an AMH value says nothing about the quality of your eggs or about your immediate natural fertility.

What about men? AMH is also produced by the Sertoli cells of the testis. It is not useful for adult male fertility, but it is valuable in pediatrics: to evaluate an undescended testicle (cryptorchidism), anorchia (absent testes), or certain differences of sex development.

Why the test is done

Your clinician may order an AMH test in several — almost always specialist — situations:¹⁴⁷

• before IVF (or another assisted reproductive technology), to estimate the ovarian response to stimulation: AMH helps choose the medication dose and anticipate the risk of ovarian hyperstimulation in high-reserve women;
• as part of an infertility work-up, to place ovarian reserve in the couple's overall picture;
• when premature ovarian insufficiency (reserve running out before age 40) is suspected;
• to help diagnose polycystic ovary syndrome (PCOS), where AMH is typically high;
• before a treatment that may be toxic to the ovaries (chemotherapy) or when discussing fertility preservation.

Outside these situations, AMH is not a screening test to run "for reassurance": the result is hard to interpret in isolation and can cause needless anxiety.

Do you need to fast?

No. The AMH test does not require fasting. Another practical advantage: unlike FSH and estradiol, which are classically drawn early in the cycle, AMH is relatively stable across the menstrual cycle and can be drawn on any day. That is a real convenience, especially for women with irregular cycles.⁶ For general blood-draw preparation, see Do you need to fast before a blood test?.

Normal ranges

There is no universal "normal" AMH value: AMH falls with age, and results depend heavily on the assay used by the lab. The figures below are therefore indicative, for a reproductive-age woman. Always compare against the range printed on your report.¹²

Units. AMH is reported in ng/mL or pmol/L. The conversion is 1 ng/mL ≈ 7.14 pmol/L. Cutoffs can differ substantially between labs depending on the analyzer, so don't compare two results from different labs without your clinician's help.¹

AMH declines steadily with age and becomes virtually undetectable at menopause, when the follicle pool is exhausted. That link to age is what makes AMH useful — but also what makes it impossible to read without accounting for your age.

Understanding your results

Low AMH

A low AMH reflects a diminished ovarian reserve: fewer small follicles remain. That is expected with age (the pool falls in every woman) and can also point to premature ovarian insufficiency, prior ovarian surgery, or chemotherapy.¹

The crucial — and most misunderstood — point: a low AMH does not mean you are infertile or that you cannot conceive naturally. A large cohort study found that, in women in their late 30s, low AMH was not associated with a lower chance of natural pregnancy over the following year.⁵ In other words, AMH is a good indicator of how many eggs can be retrieved in IVF, but a poor predictor of spontaneous fertility. In practice, a low AMH mainly signals that ovarian stimulation may respond less well, which helps tailor the protocol — not deliver a fertility "verdict."

High AMH

A high AMH signals a large number of small antral follicles. The most common cause is polycystic ovary syndrome (PCOS), where the ovaries hold many follicles stalled in their development.³ High AMH also raises the risk of ovarian hyperstimulation during IVF, which is why the medication dose is adjusted accordingly.⁴

An important update: the 2023 International Evidence-based Guideline for PCOS now accepts AMH as an alternative to ultrasound follicle counting for the morphological (polycystic ovaries) criterion in adults. AMH is not sufficient on its own for the diagnosis, and this approach does not apply to adolescents.³

AMH and its companion hormones

AMH is read together with the other markers of the hormone panel. Early-cycle FSH and estradiol, plus the antral follicle count on ultrasound, round out the reserve estimate. LH, often high relative to FSH in PCOS, supports that diagnosis. It is the combination of these results with your age and history that gives the number meaning.

AMH and cancer? An AMH test is not a cancer screening test. It speaks to ovarian reserve, not tumors. (AMH has a very specialized role in monitoring rare granulosa-cell tumors, but that is unrelated to a routine fertility work-up.)

What affects your AMH

Several factors change the AMH level or its interpretation: age (the dominant factor — AMH falls year over year), the assay/lab used (cutoffs vary), PCOS (which raises it), ovarian surgery or chemotherapy (which lower it), and hormonal contraception (the combined pill), which tends to modestly lower measured AMH. Tell your clinician your age, your medications, and your history — they change how the result is read.¹²

Recent research

According to recent PubMed-indexed publications:

• AMH enters the PCOS criteria. The 2023 international guideline for polycystic ovary syndrome recognizes AMH as an alternative to ultrasound for the morphological criterion in adults — a major shift in diagnosis.³ (Teede HJ et al., J Clin Endocrinol Metab, 2023 — DOI.)
• Predicting the age at menopause. A systematic review assessed AMH as a predictor of the age at menopause: it adds information, but with limited individual precision.⁸ Other work shows that using repeated AMH measurements over time improves that prediction versus a single draw.⁹
• A good marker for IVF, not for natural conception. A recent review reiterates that AMH predicts the ovarian response in assisted reproduction well, but remains a poor predictor of spontaneous conception.¹⁰ Ovarian-stimulation guidelines accordingly use AMH to individualize the dose and limit hyperstimulation risk.⁴

These findings concern diagnosis and research; they do not authorize self-medication and do not replace your physician's advice.

Get your AMH interpreted by AI DiagMe

An anti-Müllerian hormone level is never read alone: its meaning depends on your age, the assay used, your other markers (FSH, estradiol, LH), and your goals. That cross-reading is what gives the result its real value.

👉 AI DiagMe interprets your lab results — blood, urine, or stool — in plain language, taking your whole profile into account. An informational service that does not provide a diagnosis and complements, never replaces, your physician.

Frequently asked questions

The bottom line

The AMH blood test is the main blood marker of ovarian reserve: it estimates your pool of follicles, not egg quality and not natural fertility. Keep the ballpark in mind (~1.0–4.0 ng/mL in reproductive-age women, highly age- and lab-dependent), remember that a high AMH suggests PCOS, and above all that a low AMH does not mean "infertile": it's a good guide for IVF, a poor predictor of natural conception. No value is read alone — it's your whole set of markers, your age, and your goals that count, which is what AI DiagMe provides, alongside your physician.

Sources

Official sources and peer-reviewed publications (PubMed) used for this guide: