Anti-Müllerian hormone can reflect the size of your egg supply (Dewailly et al., 2014). It does not measure egg quality. It does not tell you when your fertility ends. And a low number may not mean you cannot get pregnant - it may mean you have fewer tries, not no tries.
AMH has become the most talked-about fertility biomarker, partly because it's easy to draw (no cycle-day timing required) and partly because it produces a number that feels definitive. Women receive their AMH result in a vacuum and read it as a deadline. It may not be a deadline. It can be a gauge.
What AMH actually measures
AMH is secreted by the granulosa cells of small antral follicles - the pool of developing eggs waiting in the ovary at any given time (Weenen et al., 2004). A higher AMH may point to a larger pool; a lower AMH may point to a smaller one. Because this pool can decline with age, AMH can correlate with reproductive age (Dewailly et al., 2014). But the relationship is probabilistic, not deterministic. Women with low AMH can conceive naturally every day (Steiner et al., 2017).
Crucially, AMH may say nothing about the chromosomal quality of those eggs (Pipari et al., 2021). Egg quality is largely a function of chronological age - specifically, the age at which meiosis completes. A 28-year-old with low AMH may have the egg quality of a 28-year-old (Morin et al., 2018). A 42-year-old with high AMH may have the egg quality of a 42-year-old. The age of the woman may matter far more than the AMH level when it comes to pregnancy outcomes.
Low AMH at different ages may mean different things
Low AMH at 28 may warrant attention and possibly earlier family planning conversations. Low AMH at 42 may be expected biology - the reserve may have been declining for two decades (Dewailly et al., 2014). The clinical response to the same number can differ completely based on where you are in your reproductive lifespan.
The PCOS misread
Women with PCOS can have very high AMH - sometimes three to four times above the average for their age. This can reflect the large antral follicle count that characterises the condition, not exceptional fertility (Bhide et al., 2016). High AMH in PCOS may mean many follicles that struggle to ovulate (Komorowski et al., 2024). The fertility barriers in PCOS can be ovulatory and metabolic, not a function of reserve.
What AMH is actually useful for
- Baseline for egg freezing decisions - lower reserve may suggest earlier rather than later.
- Predicting ovarian response to stimulation protocols in IVF - higher AMH may mean more eggs retrieved (Fauser, 2026).
- Monitoring decline over time - serial AMH values can track trajectory, which may be more informative than a single number.
- Flagging premature ovarian insufficiency - AMH below 0.1 ng/mL in a woman under 40 may warrant further evaluation.
How to use your result
If your AMH is lower than expected for your age, the useful question is not 'am I running out of time?' but 'does this change any decision I was about to make?' For some women, the answer is yes - they accelerate a conversation about partnership, timing, or egg freezing. For others, the number is a data point that changes nothing practical. Both are valid responses.
What AMH cannot do is tell you whether you will get pregnant, how quickly, or by what means. For that, you need a full fertility workup - day-3 and day-21 labs, a semen analysis, and a clinical evaluation - not a single hormone value.
References
- Dewailly, D., et al. (2014). The physiology and clinical utility of anti-Mullerian hormone in women. Human Reproduction Update, 20(3), 370-385. PMID 24430863
- Weenen, C., et al. (2004). Anti-Müllerian hormone expression pattern in the human ovary: potential implications for initial and cyclic follicle recruitment. Molecular Human Reproduction, 10(2), 77-83. PMID 14742691
- Steiner, A. Z., et al. (2017). Association Between Biomarkers of Ovarian Reserve and Infertility Among Older Women of Reproductive Age. JAMA, 318(14), 1367-1376. PMID 29049585
- Pipari, A., et al. (2021). Serum anti-Müllerian hormone levels are not associated with aneuploidy rates in human blastocysts. Reproductive Biomedicine Online, 42(6), 1211-1218. PMID 33849787
- Morin, S. J., et al. (2018). Diminished ovarian reserve and poor response to stimulation in patients <38 years old: a quantitative but not qualitative reduction in performance. Human Reproduction, 33(8), 1489-1498. PMID 30010882
- Bhide, P., et al. (2016). Anti-Müllerian hormone and polycystic ovary syndrome. Best Practice & Research Clinical Obstetrics & Gynaecology, 37, 38-45. PMID 27103234
- Komorowski, A. S., et al. (2024). Antimüllerian hormone level predicts ovulation in women with polycystic ovary syndrome treated with clomiphene and metformin. Fertility and Sterility, 121(4), 660-668. PMID 38154770
- Fauser, B. C. J. M. (2026). Developing anti-Müllerian hormone as an ovarian reserve biomarker. Molecular Human Reproduction, 32(2), gaag021. PMID 42062769
