AMH Levels by Age: What the Numbers Mean

What AMH is and what it measures

AMH is a hormone made by the small follicles in the ovaries. Its blood level gives an estimate of ovarian reserve, which the American Society for Reproductive Medicine (ASRM) defines as the number of oocytes (eggs) remaining in the ovary, or oocyte quantity. For how the test fits into a couples workup, see our page on the AMH test.

ASRM's committee opinion on testing ovarian reserve says markers like AMH can be useful as predictors of oocyte yield after ovarian stimulation and egg retrieval. It also says they are poor predictors of reproductive potential independently of age. In plain terms, AMH is a count-style measure for the lab or the fertility clinic, not a verdict on whether you can conceive.

How AMH changes with age

Across studies, the pattern is the same: average AMH falls as age rises. A study of 17,120 women aged 24 to 50 who presented to fertility centers in the United States (all samples run at one reference laboratory) found that median and mean AMH decreased steadily with age. The median fell by about 0.2 ng/mL per year through age 35 and by about 0.1 ng/mL per year after that.

That is the average of a group, and it describes women who were already seeing a fertility clinic. The decline is not identical for every person, and a single value cannot tell you when your own AMH will reach a given level.

Published age-specific values

To see what age-specific reference data look like, here is one published example. It is from a study of 1,298 women in Korea with regular menstrual cycles, aged 20 to 50, whose AMH was measured with a commercial enzyme-linked immunoassay. The table gives the median for each age group and the lower 5th percentile, meaning the value below which 5 in 100 women in that group fell.

Source: Yoo JH, et al., Clin Exp Reprod Med, 2011. Korean women with regular menstruation, one assay. Do not use these as your own reference range.

Do not read this as a chart to place yourself on. It is one population, one assay, and one period. A study of 2,495 women aged 19 to 50 from the Arabian Peninsula, seen at fertility centers, reported a median AMH of 1.76 ng/mL at a median age of 34.81 years, a decline of about 0.1 ng/mL per year up to age 36 and an accelerated decline of about 0.23 ng/mL per year between 36 and 40. Its authors noted that age-specific AMH references were based primarily on Caucasian populations and may vary across ethnic groups, and they presented their data to address that gap.

Why labs and studies disagree

Part of the difference between studies is who was tested. Women who regularly cycle, women attending fertility clinics, and women from different regions are not the same group, so their averages differ.

Part of it is the test itself. A World Health Organization collaborative study created a reference reagent for AMH because AMH immunoassays needed a common reference material. When 21 assay and platform combinations from seven laboratories measured the same material, the study reported high between-method variability in the content estimates. In practice, an AMH value from one lab is not always directly comparable to one from another.

The practical rule: read your result against the reference range printed on your own report, check the units, and if you retest, use the same lab when you can.

What AMH cannot tell you

The most important limit is that AMH reflects quantity, not quality. ASRM states that ovarian reserve means the number of oocytes. Nothing in an AMH level tells you whether those eggs are chromosomally normal.

A study published in JAMA tested whether low reserve predicts trouble conceiving. It followed 750 women aged 30 to 44 in the Raleigh-Durham, North Carolina area who had no history of infertility and had been trying to conceive for three months or less. Women with low AMH (below 0.7 ng/mL) did not have a significantly different predicted probability of conceiving than women with normal values. The authors concluded that biomarkers of diminished ovarian reserve were not associated with reduced fertility in this group and that the findings do not support using AMH or FSH to assess natural fertility.

That finding applies to women without known infertility who were trying naturally. It does not mean AMH is useless. A low result can matter for planning fertility treatment, which is why clinicians still read it, but it should not be read as a deadline or a diagnosis by itself.

What a low AMH can lead to

Because AMH is one input, a clinician reads it with your age, your cycle history, the antral follicle count on a pelvic ultrasound, and your other hormones. Low ovarian reserve is one of the findings that can be best treated in person, at a fertility clinic.

If your result is low or high, avoid drawing conclusions from the number alone. Ask what it changes about your plan, and whether repeating the test or adding an ultrasound would help.

How AMH fits into couples care at Gala

At Gala Fertility, AMH is part of her bloodwork, tested with FSH, estradiol, LH, prolactin, and TSH at a Quest lab that takes walk-ins. AMH is not affected by cycle timing, while her other cycle-day hormones are read on day 2 to 5 of her period. A clinician reviews it together with her pelvic ultrasound and his results, then explains everything on one video visit. Gala Fertility is for male-female couples who are both 18 or older and not in New York, New Jersey, or Rhode Island. If a finding such as low ovarian reserve is best treated in person, your clinician refers you to a fertility clinic and explains why.

For more on the test itself, read AMH test and ovarian reserve. You can also see her side of the workup, how long to try before testing, or fertility testing for couples. To get started, start your fertility intake together.

This article is general education, not medical advice. Talk to a clinician about your own results.

Sources

1. Practice Committee of ASRM. Testing and interpreting measures of ovarian reserve: a committee opinion. Fertil Steril. 2020.
2. Steiner AZ, et al. Association between biomarkers of ovarian reserve and infertility among older women of reproductive age. JAMA. 2017.
3. Seifer DB, Baker VL, Leader B. Age-specific serum anti-Müllerian hormone values for 17,120 women presenting to fertility centers within the United States. Fertil Steril. 2011.
4. Yoo JH, et al. Age specific serum anti-Müllerian hormone levels in 1,298 Korean women with regular menstruation. Clin Exp Reprod Med. 2011.
5. Melado L, et al. Ethnic and sociocultural differences in ovarian reserve: age-specific anti-Müllerian hormone values and antral follicle count for women of the Arabian Peninsula. Front Endocrinol. 2021.
6. Ferguson J, et al. Establishment of a WHO Reference Reagent for anti-Mullerian hormone. Reprod Biol Endocrinol. 2020.

This article is for general information and is not medical advice. Talk to a licensed provider about your own health.