AMH (Anti-Mullerian Hormone) Test

An AMH blood test measures anti-Mullerian hormone, which is produced by small follicles in the ovaries. It is often used as a marker of ovarian reserve, giving an estimate of the remaining pool of eggs, and it is relatively stable across the menstrual cycle.

What the test measures

Anti-Mullerian hormone (AMH) is made by the granulosa cells surrounding early-stage follicles in the ovaries. The number of these small, developing follicles tends to track with the overall size of the egg pool, so AMH serves as an indirect marker of ovarian reserve. As the pool of eggs declines naturally over time, the number of small follicles falls and AMH tends to fall with it.

In people with testes, AMH plays an important role during early development, but the blood test is most commonly used in the context of female fertility. A useful feature of AMH is that it changes relatively little across the menstrual cycle compared with hormones such as FSH or estradiol, so the timing of the draw is usually less critical and the test can often be done on any day of the cycle.

What "ovarian reserve" does and does not mean

Ovarian reserve refers to the quantity of eggs remaining, not their quality. AMH offers an estimate of that quantity, which is helpful for understanding how the ovaries might behave, for example during fertility treatment. It does not measure the genetic health of individual eggs, and it cannot tell anyone whether or when a pregnancy will happen. This distinction is central to reading the test sensibly.

Why a clinician might order it

A clinician may order AMH when evaluating fertility, planning assisted reproduction, or assessing how the ovaries might respond to stimulation during treatment. It can also be checked when investigating conditions such as polycystic ovary syndrome, where AMH is often higher because of the larger number of small follicles, or when estimating how close someone may be to menopause. Throughout, AMH is used to estimate the size of the remaining egg pool rather than to predict a specific outcome.

Part of what makes AMH attractive in these settings is its convenience. Because it does not swing dramatically across the cycle, it can be drawn without careful scheduling, and a single sample gives a reasonably stable estimate. That said, convenience is not the same as completeness, and a thorough fertility assessment combines AMH with other findings rather than relying on it alone. The test answers a narrow question about quantity, and clinicians keep that scope in mind when deciding what, if anything, a result should change.

How to prepare

AMH usually does not require fasting or a specific cycle day, which is one reason it is convenient to order. The test is a routine venous blood draw. Hormonal contraception and some medications may modestly lower the measured value, so it helps to share what you are taking with the testing team. Because assays differ between laboratories, comparing results across different labs can be misleading, and following the same lab over time is generally more reliable.

What can affect results

Several factors influence AMH apart from the underlying size of the egg pool:

• Age. AMH generally declines as a person grows older, which is why ranges are age-specific.
• Polycystic ovary syndrome. The greater number of small follicles often raises AMH.
• Hormonal contraception. Some forms may modestly lower the measured value.
• Assay differences. The same sample can read differently between laboratories, so results are best compared within one lab.

How results are generally interpreted

Interpretation depends on age and the clinical question being addressed.

• Higher AMH generally suggests a larger pool of small follicles and is sometimes seen in polycystic ovary syndrome.
• Lower AMH may suggest a smaller remaining egg pool, which tends to decline naturally with age.
• Trends over time and the broader clinical picture are usually more useful than a single isolated value.

Illustrative reference ranges

The values below are illustrative only and vary by laboratory, assay, and especially age. Always use the age-specific range printed on your own report.

AMH in fertility planning

One of the most common uses of AMH is to help anticipate how the ovaries might respond to stimulation during assisted reproduction. A higher reserve often suggests the ovaries may produce more follicles in response, while a lower reserve may suggest a more modest response. This information can help a care team tailor an approach and set expectations, but it remains an estimate of quantity rather than a prediction of success. AMH is best understood as one input among several, used alongside age, an antral follicle count, and other hormone measurements to build a fuller picture.

What happens during the test

An AMH test uses a standard blood draw from a vein in the arm. The skin is cleaned, a tourniquet is applied briefly, and a small tube of blood is collected. The procedure takes only a few minutes and can usually be done on any day of the cycle. Most people feel only a quick pinch and can resume normal activity right away; any minor bruising fades on its own.

Why AMH is read alongside age

Because AMH naturally declines over the years, the same value can mean different things at different ages. A given level might be unremarkable for one age group yet notable for another, which is why age-specific ranges and the overall context matter so much. Reading AMH against age, rather than against a single fixed cutoff, helps avoid both false reassurance and unnecessary worry, and it keeps the focus on the broader fertility assessment rather than on one number.

Related tests

AMH is often interpreted alongside an antral follicle count and other reproductive hormones. Within this set of pages, it may be considered with progesterone when ovulation and cycle patterns are being assessed, and with DHEA-sulfate or SHBG when polycystic ovary syndrome is considered. See the blood tests index, explore related conditions, or browse the hormones pages.