Your AMH (Anti-Müllerian Hormone) result is a snapshot of your ovarian reserve, essentially an estimate of how many eggs your ovaries have left. The number on your lab report matters most when compared to the typical range for your age, since AMH declines naturally over time. A 30-year-old with an AMH of 1.5 ng/mL is in a very different situation than a 40-year-old with the same number.
What AMH Actually Measures
AMH is produced by cells inside the small, developing follicles in your ovaries. It doesn’t come from your entire egg supply, only from follicles that have “woken up” and started growing. That means your AMH level is an indirect marker of how many eggs remain, not a direct count. A higher number suggests a larger pool of developing follicles; a lower number suggests a smaller one.
AMH also plays a regulatory role. It slows the rate at which resting follicles get recruited into the growth pipeline and reduces the follicles’ sensitivity to FSH, the hormone that drives egg maturation each cycle. Think of it as a brake pedal that helps pace the depletion of your egg supply over time.
Check Your Units First
Before comparing your result to any reference range, confirm which unit your lab used. The two standard units are ng/mL and pmol/L. To convert between them, multiply ng/mL by 7.18 to get pmol/L. So an AMH of 2.0 ng/mL equals roughly 14.4 pmol/L. The ranges below use ng/mL, which is the most common unit in North American labs.
Typical AMH Levels by Age
A large cohort study of nearly 23,000 women established the following median AMH values at key ages, along with the range that captures the middle 50% of results (25th to 75th percentile):
- Age 20: Median 4.2 ng/mL (middle range 2.5 to 6.7)
- Age 25: Median 3.3 ng/mL (middle range 1.9 to 5.7)
- Age 30: Median 2.5 ng/mL (middle range 1.2 to 4.3)
- Age 35: Median 1.4 ng/mL (middle range 0.5 to 2.9)
- Age 40: Median 0.5 ng/mL (middle range 0.2 to 1.3)
- Age 45: Median 0.1 ng/mL (middle range 0.05 to 0.3)
Notice how wide the normal range is at every age. At 30, one woman might have an AMH of 1.2 and another 4.3, and both fall squarely in the middle half of results. That spread is why a single number without age context is nearly meaningless.
What a Low Result Means
An AMH that falls below the typical range for your age points toward diminished ovarian reserve, meaning your egg supply is lower than expected. When AMH drops below 1.0 ng/mL, it’s generally considered severely low regardless of age. At 35, about 46% of women already have an AMH below 1.2 ng/mL, so a result in that range at 35 is far less alarming than the same number at 25.
A low AMH does not mean you cannot conceive. It signals that the window may be narrower and that fewer eggs are likely available during fertility treatments. In IVF, women with very low AMH (under 0.5 ng/mL) typically produce fewer eggs at retrieval, averaging around 3 to 4 mature eggs per cycle. Pregnancy rates per embryo transfer in this group range from roughly 17% to 32% depending on the exact AMH level, with slightly better odds at the higher end of that low range. Age remains a powerful factor here: younger women with low AMH tend to have better egg quality than older women with the same number.
What a High Result Means
A very high AMH can signal polycystic ovary syndrome (PCOS). Women with PCOS typically have AMH levels two to three times higher than average because their ovaries contain an unusually large number of small follicles. Research on diagnostic thresholds found that AMH above 8.16 ng/mL in women aged 20 to 29, or above 5.89 ng/mL in women aged 30 to 39, was the most reliable cutoff for identifying PCOS (though exact thresholds can vary by population).
A high AMH is also relevant if you’re planning IVF. It predicts a strong ovarian response to stimulation medications, which means more eggs at retrieval but also a higher risk of ovarian hyperstimulation syndrome. Your fertility team will typically adjust medication doses downward to manage that risk.
How AMH Compares to FSH Testing
FSH (follicle-stimulating hormone) is the older ovarian reserve test. It works indirectly: as your egg supply drops, your body produces less of the signals that keep FSH in check, so FSH levels rise. The problem is that FSH fluctuates significantly from cycle to cycle and even within a single cycle, so one reading can be misleading. It also has to be drawn on day 2, 3, or 4 of your period to be interpretable.
AMH is more stable. Because it isn’t driven by your brain’s hormonal signaling the way FSH is, it stays relatively consistent throughout the menstrual cycle and from one cycle to the next. It also picks up declining ovarian reserve earlier. AMH tends to drop before FSH starts rising, making it a more sensitive early indicator. For these reasons, AMH has largely replaced FSH as the primary ovarian reserve marker in fertility clinics. Combining multiple markers hasn’t been shown to improve prediction compared to AMH alone.
Factors That Can Skew Your Result
Several things can make your AMH look artificially low, which matters if you’re making decisions based on the number.
Hormonal birth control has the biggest impact. A study of over 27,000 women found that the combined pill, vaginal ring, and hormonal implant each suppressed AMH by roughly 22 to 24%. The progestin-only pill lowered it by about 15%, and hormonal IUDs by about 7%. These effects are temporary, but if your blood was drawn while you were on any of these methods, your true AMH is likely higher than the number on the report. Most clinicians recommend testing at least a few months after stopping hormonal contraception for an accurate reading.
Cycle timing may also play a small role. While AMH has long been considered cycle-independent, a meta-analysis of 11 studies found that levels in the first half of the cycle (follicular phase) run about 11.5% higher than in the second half (luteal phase). This difference is modest but worth knowing if your result is borderline.
Vitamin D and Other Variables
You may have seen claims that vitamin D deficiency lowers AMH. The evidence here is genuinely mixed. Some studies find a link, others don’t, and the relationship may depend on whether someone has PCOS, their ethnicity, and their baseline vitamin D status. A recent meta-analysis concluded that vitamin D supplementation might reduce AMH in certain subgroups (particularly those with low baseline vitamin D), but overall the connection remains unclear. It’s not something to lose sleep over when interpreting your results.
What AMH Cannot Tell You
AMH reflects egg quantity, not egg quality. Egg quality is overwhelmingly determined by age. A 28-year-old with a low AMH of 0.8 ng/mL has fewer eggs than average, but each egg is still relatively likely to be chromosomally normal. A 42-year-old with the same AMH has the same quantity problem plus a much higher rate of chromosomal abnormalities in each egg. This is why AMH alone is a poor predictor of whether you’ll get pregnant naturally. It’s most useful for predicting how your ovaries will respond to fertility medications and for making time-sensitive decisions about egg freezing or IVF.
AMH also doesn’t predict menopause timing with precision. While a steep decline suggests the transition is approaching, individual variation is too wide for AMH to give you a reliable countdown.