Egg levels refer to a woman’s ovarian reserve, the estimated pool of eggs remaining in the ovaries at any given time. The most widely used blood marker for this is anti-Müllerian hormone (AMH), a hormone produced by small growing follicles in the ovary whose concentration tracks closely with how many of those follicles are present.1PubMed Central. Anti-Müllerian Hormone and Ovarian Reserve: Update on Assessing Ovarian Function But the relationship between a number on a lab report and your actual fertility is more complicated than most people realize, and the growing market of at-home egg-level tests has made this distinction more urgent than ever.
How Egg Levels Are Measured
Clinicians rely on several markers to estimate ovarian reserve, each capturing a different piece of the picture. AMH is the most popular because it can be drawn on any day of the menstrual cycle and stays relatively stable from month to month. It is made by the granulosa cells lining preantral and small antral follicles, which are the follicles actively growing but not yet large enough to ovulate.2Human Reproduction. Serum anti-Müllerian hormone levels: a novel measure of ovarian reserve A higher AMH generally means more of those follicles are present; a lower one means fewer.
Antral follicle count (AFC) is the other workhorse test. During a transvaginal ultrasound early in the cycle, a clinician counts the small follicles visible on each ovary. Some research suggests AFC correlates with the number of eggs retrieved during IVF at least as well as AMH does, and it has the advantage of being immediate and inexpensive.3PubMed Central. Correlation of Anti-Mullerian Hormone Level and Antral Follicle Count with Oocyte Number in A Fixed-Dose Controlled Ovarian Hyperstimulation of Patients of In Vitro Fertilization Program A systematic review and meta-analysis found no significant difference in overall accuracy between AMH and AFC when predicting how someone would respond to ovarian stimulation.4PubMed Central. Comparison of anti-Müllerian hormone and antral follicle count in the prediction of ovarian response: a systematic review and meta-analysis
Two older markers round out the panel. Day-3 FSH (follicle-stimulating hormone) is drawn on the third day of the menstrual cycle. Lower FSH values are generally favorable; higher values suggest the brain is working harder to stimulate follicles that are not responding well. Early studies showed that patients with low day-3 FSH had substantially higher pregnancy rates during IVF than those with elevated levels.5PubMed. Follicle-stimulating hormone levels on cycle day 3 are predictive of in vitro fertilization outcome Day-3 estradiol works as a companion check: when estradiol is elevated early in the cycle, it can mask an otherwise high FSH, giving a falsely reassuring picture. One study found that patients with day-3 estradiol at or above 80 pg/mL had much higher cycle cancellation rates and lower pregnancy rates during IVF, even when their FSH looked normal.6PubMed. Prognostic value of day 3 estradiol on in vitro fertilization outcome
One practical wrinkle worth knowing: AMH assays have historically varied between labs. Older enzyme-linked immunosorbent assays (ELISA) had enough variability to make comparing results from different labs unreliable.7PubMed. Multicenter analytical performance evaluation of a fully automated anti-Müllerian hormone assay and reference interval determination Newer automated platforms have improved consistency, but if you are tracking AMH over time, try to use the same lab and assay each time.
Egg Quantity Versus Egg Quality
This is the single most misunderstood part of the conversation. AMH and AFC tell you about quantity: roughly how many follicles are in the pool. They do not tell you about quality: whether any individual egg has the chromosomal normalcy needed to become a healthy embryo. Quality is primarily determined by age. A 28-year-old with a low AMH still tends to produce chromosomally normal eggs from the smaller batch she has. A 42-year-old with a robust AMH may retrieve more eggs during IVF, but a larger share of them will carry chromosomal errors.
Research on women of advanced reproductive age undergoing IVF supports this distinction. In one study, eggs from older women with low AMH showed slightly reduced developmental potential in the lab compared to eggs from older women with higher AMH, but once embryos were transferred, the pregnancy outcomes were similar. The authors concluded that diminished ovarian reserve in older women represents a decrease in egg quantity, not egg quality.8Scientific Reports. AMH has no role in predicting oocyte quality in women with advanced age undergoing IVF/ICSI cycles This is a critical point for anyone reading a lab slip: a low AMH does not mean your eggs are damaged. It means you have fewer of them.
The Natural Egg Depletion Timeline
You are born with all the eggs you will ever have. The loss begins before birth and continues throughout life through a process of exponential depletion that occurs in every mammal studied.9PubMed Central. The menopause and aging, a comparative perspective This loss is not driven by ovulation. Hundreds of follicles begin maturing each cycle, and in a natural cycle only one is selected while the rest are reabsorbed. The vast majority of eggs are lost through this background attrition, not through monthly release.10PubMed. Evolution of the menopause: life histories and mechanisms
AMH tends to peak in the early-to-mid twenties and then declines gradually, with a steeper drop in the mid-to-late thirties. By the time menopause arrives, follicle counts are essentially at zero and AMH becomes undetectable. The rate of decline varies enormously between individuals, which is exactly why people get tested in the first place. Two women the same age can have dramatically different AMH values.
Do Egg Levels Predict Natural Pregnancy?
For most people searching their AMH results, this is the real question: does a low number mean I will have trouble getting pregnant on my own? The honest answer, backed by multiple studies, is that AMH is a poor predictor of natural conception. A systematic review and meta-analysis of over 4,300 women found that AMH had limited ability to discriminate between those who would and would not conceive spontaneously.11PubMed Central. The Value of Anti-Müllerian Hormone in the Prediction of Spontaneous Pregnancy: A Systematic Review and Meta-Analysis
A study of women who conceived naturally found no relationship between AMH concentration and the time it took to get pregnant. The only variable that affected the probability of pregnancy within three or six months was age.12PubMed. AMH concentration is not related to effective time to pregnancy in women who conceive naturally Another study compared women with unexplained infertility to those with male-factor infertility and found that low AMH (below 0.7 ng/mL) was no more common in the unexplained group, suggesting the low AMH itself was not the cause of their difficulty conceiving.13PubMed Central. Ovarian reserve does not influence natural conception: insights from infertile women
The takeaway is important: a low AMH does not mean you cannot conceive. You only need one good egg per cycle, and AMH does not measure whether this cycle’s egg is chromosomally normal. It is a quantitative marker, not a qualitative one. This is exactly the distinction that gets lost when people receive their results without adequate counseling.
What Egg Levels Mean for IVF
In the context of assisted reproduction, egg levels are far more useful. IVF depends on retrieving multiple eggs in a single cycle so that clinicians have more embryos to work with. A higher AMH reliably predicts a higher egg yield. One retrospective study found that women with AMH at or above 1.10 ng/mL retrieved significantly more oocytes (around 12 on average) and had more mature and fertilized eggs than those with lower levels.14PubMed Central. Association Between AMH Levels and Fertility/Reproductive Outcomes Among Women Undergoing IVF: A Retrospective Study Patients with lower AMH and AFC consistently produce fewer eggs during stimulation.15Reproductive BioMedicine Online. Anti-Müllerian hormone as a predictor of IVF outcome
Even among women with very low AMH, age remains the dominant factor in IVF success. A study of patients with very low AMH found that those under 35 had a clinical pregnancy rate of about 31% per egg retrieval, compared with roughly 23% for those aged 35–39 and about 10% for those 40–43.16PubMed Central. IVF results in patients with very low serum AMH are significantly affected by chronological age So a young woman with a low AMH still has reasonable odds per cycle. She may just have fewer cycles to work with, since fewer eggs are retrieved each time.
Can AMH Predict When You Will Reach Menopause?
Because AMH tracks follicle count and follicle depletion leads to menopause, researchers have tried to use AMH as a crystal ball for menopause timing. AMH does predict time to menopause better than FSH or inhibin B. In one longitudinal study, women aged 45–48 with baseline AMH below 0.20 ng/mL had a median time to menopause of about six years, while women aged 35–39 with the same low AMH had a median time to menopause of about ten years.17PubMed Central. Anti-mullerian hormone as a predictor of time to menopause in late reproductive age women That same study found that smoking significantly shortened the time to menopause.
But the precision of these estimates has limits. A systematic review noted that for women under 40, AMH-based predictions of menopause timing carried confidence intervals spanning two to twelve years, which is too wide to be clinically actionable.18Human Reproduction Update. Anti-Müllerian hormone for the diagnosis and prediction of menopause: a systematic review An individual-patient-data meta-analysis found that while AMH did add some predictive power beyond age alone, the improvement was modest for most women. The exception was early menopause (at or before age 45), where AMH added meaningful prediction on top of age.19The Journal of Clinical Endocrinology & Metabolism. Does AMH Relate to Timing of Menopause? Results of an Individual Patient Data Meta-Analysis
When High Egg Levels Signal a Problem
A very high AMH is not always good news. In women with polycystic ovary syndrome (PCOS), AMH levels are often two to three times higher than expected for age. This happens because PCOS involves an excess of small antral follicles, each producing normal amounts of AMH that add up to a strikingly elevated total. Researchers have proposed that this elevated AMH may itself contribute to the hallmark feature of PCOS, the arrested development of follicles, by interfering with the action of FSH at the point where a dominant follicle would normally be selected.20The Journal of Clinical Endocrinology & Metabolism. Elevated Serum Level of Anti-Mullerian Hormone in Patients with Polycystic Ovary Syndrome: Relationship to the Ovarian Follicle Excess and to the Follicular Arrest If your AMH is unusually high and you also have irregular cycles, a clinician should evaluate for PCOS rather than congratulate you on a plentiful egg supply.
Diminished Ovarian Reserve and Early Insufficiency
On the opposite end, some women experience a decline in ovarian reserve faster than expected for their age. This is called diminished ovarian reserve (DOR), and in its more severe form, primary ovarian insufficiency (POI), the ovaries stop functioning well before the typical age of menopause. Causes include genetic factors, autoimmune conditions, chemotherapy, pelvic radiation, and ovarian surgery, though in many cases no clear cause is found.21PubMed Central. Diminished Ovarian Reserve: A Narrative Review of Etiologies and Possible Therapeutic Approaches Clinical risk factors alone identify only about half of women at risk of low ovarian reserve, which has led some researchers to recommend AMH screening for all women in their thirties who are not yet trying to conceive.22PubMed. Review of clinical indicators, including serum anti-Müllerian hormone levels, for identification of women who should consider egg freezing
Things That Temporarily Shift Your Numbers
Your AMH result can be artificially lowered by hormonal contraceptives. A large cross-sectional study of over 27,000 women found that users of combined oral contraceptives had AMH levels roughly 24% lower than non-users. Similar drops were seen with the vaginal ring and the hormonal implant. Even the progestin-only pill was associated with about a 15% reduction.23PubMed. Anti-Müllerian hormone levels among contraceptive users: evidence from a cross-sectional cohort of 27,125 individuals The suppression is reversible. One study found that AMH rose by an estimated 53% within three months of stopping combined oral contraceptives.24PubMed. Ovarian reserve markers after discontinuing long-term use of combined oral contraceptives Former users who had been off contraceptives for a period showed little difference from women who had never used them.25PubMed Central. Duration, recency, and type of hormonal contraceptive use and antimüllerian hormone levels
The practical point: if you are on hormonal birth control and get an AMH test, the result may underestimate your true reserve. A clinician familiar with this effect will either wait until you have been off contraceptives for a few months before testing or will interpret the number with that context in mind.
Endometriosis and Ovarian Surgery
Endometriosis is associated with lower AMH independently of whether a woman has had surgery. A study comparing infertile women found that those with endometriosis (with or without prior ovarian surgery) had a mean AMH around 2.5 ng/mL compared to 3.6 ng/mL in women with male-factor infertility alone. About a quarter of women in the endometriosis groups had AMH below 1 ng/mL, roughly double the rate seen in the comparison group.26PubMed Central. The effect of endometriosis on the antimüllerian hormone level in the infertile population
Surgery to remove endometriomas (ovarian cysts caused by endometriosis) further reduces AMH. A systematic review and meta-analysis found that laparoscopic removal of endometriomas had lasting negative effects on AMH in the short, medium, and long term. The damage was worse for bilateral endometriomas, for larger cysts (above 7 cm), and when bipolar energy was used for hemostasis compared to suturing or sealant techniques.27PubMed Central. The Effect of Laparoscopic Endometrioma Surgery on Anti-Müllerian Hormone: A Systematic Review of the Literature and Meta-Analysis This means the decision to operate on an endometrioma involves weighing pain relief and disease management against a permanent hit to ovarian reserve.
Environmental Exposures
Emerging research has linked certain environmental chemicals to lower AMH. A study of women of reproductive age found that higher urinary concentrations of several phthalate metabolites were associated with lower overall AMH levels over time.28PubMed Central. Associations of bisphenol and phthalate exposure and anti-Müllerian hormone levels in women of reproductive age Phthalates are plasticizers found in a wide range of consumer products, from food packaging to personal care items. Volatile organic compound metabolites and certain polycyclic aromatic hydrocarbon metabolites have also been associated with a less favorable ratio of FSH to AMH, an indicator of declining ovarian reserve.29PubMed Central. Association between environmental pollutants and the FSH/AMH ratio as a marker of ovarian reserve The bisphenol A story, by contrast, has been less clear: the phthalate study found no significant association between BPA and AMH. The field is still young, and the effect sizes are small, but the direction of findings is consistent enough to warrant attention.
Vitamin D and Supplement Claims
Vitamin D’s relationship to AMH has produced conflicting results. One study found that both vitamin D and AMH levels showed seasonal variation in women, with AMH dropping about 18% in winter compared to summer, and that vitamin D supplementation prevented this seasonal dip.30The Journal of Clinical Endocrinology & Metabolism. The Level of Serum Anti-Müllerian Hormone Correlates with Vitamin D Status in Men and Women But Not in Boys But another study of women attending a fertility clinic found no association between vitamin D status and AMH levels after controlling for relevant variables.31Human Reproduction. Serum anti-Mullerian hormone production is not correlated with seasonal fluctuations of vitamin D status in ovulatory or PCOS women A meta-analysis tried to reconcile these results and found that the answer depends on the population: vitamin D supplementation appeared to increase AMH in ovulatory women without PCOS, but actually decreased AMH in women with PCOS.32PubMed Central. The Association between Vitamin D and Anti-Müllerian Hormone: A Systematic Review and Meta-Analysis This split makes blanket advice difficult.
Coenzyme Q10 (CoQ10) has attracted interest because of its role in mitochondrial energy production, which is critical for egg maturation. Animal research showed that age-related declines in oocyte quality and quantity could be reversed with CoQ10 administration, and the authors attributed this to improved mitochondrial performance.33PubMed Central. Coenzyme Q10 restores oocyte mitochondrial function and fertility during reproductive aging A recent review argued that clinical studies show CoQ10 supplementation can enhance ovarian function and embryo quality, particularly in women with weak ovarian reserve or older age.34PubMed Central. Exploring the protective effects of coenzyme Q10 on female fertility However, another review cautioned that the available human data do not yet clearly prove CoQ10 improves oocyte quality.35PubMed Central. Does Coenzyme Q10 Supplementation Improve Human Oocyte Quality? For now, CoQ10 is a reasonable supplement with a plausible mechanism but not yet a proven intervention for egg quality in humans.
Genetic Roots of Egg Levels
Your baseline AMH is not entirely under your control. A genome-wide association study of pre-menopausal women identified a genetic variant (rs16991615) that was strongly associated with AMH levels and had previously been linked to age at menopause. Women who were genetically predisposed to earlier menopause had lower AMH levels during their reproductive years, by about 0.18 standard deviations for each year earlier their genes predicted menopause would arrive.36PubMed Central. Genome-wide association study of anti-Müllerian hormone levels in pre-menopausal women of late reproductive age and relationship with genetic determinants of reproductive lifespan Genetic variants associated with FSH levels have also been identified, with some differences between racial groups.37Human Reproduction. Genetic variants and environmental factors associated with hormonal markers of ovarian reserve in Caucasian and African American women This genetic component helps explain why sisters can have very different AMH results at the same age, and why family history of early menopause is one of the few useful non-blood-test clues about ovarian reserve.
Testosterone Therapy and Ovarian Reserve
Transgender men receiving testosterone therapy experience a decrease in AMH. One study found that AMH fell significantly after about 16 weeks of testosterone use, from an average of 4.4 μg/L to 1.4 μg/L.38PubMed. Antimüllerian hormone levels decrease in female-to-male transsexuals using testosterone as cross-sex therapy However, longer-term data paint a more reassuring picture. A cross-sectional study found that AMH levels in transgender men on testosterone correlated with age but not with how long they had been on treatment, and levels stayed within normal age-specific ranges. Several participants fathered biological children after stopping testosterone, even after up to 12 years of treatment.39PubMed. Functional ovarian reserve in transgender men receiving testosterone therapy: evidence for preserved anti-Müllerian hormone and antral follicle count under prolonged treatment This is encouraging for transgender men who may want biological children in the future, though individual outcomes will vary.
The Problem With Direct-to-Consumer Testing
A growing number of companies now sell at-home AMH tests, often marketed with language that implies the result can tell you how fertile you are. Research into these websites has identified two major risks. First, a normal or high result may falsely reassure someone into delaying pregnancy, when in reality age is the single biggest driver of natural fertility and AMH says little about natural conception chances. Second, a low result may create unnecessary panic, pressuring someone to conceive earlier than they want to or pursue fertility treatments they may not actually need.40PubMed Central. Websites Selling Direct-to-Consumer Anti-Mullerian Hormone Tests
Surveys of women who received AMH testing have documented significant psychological distress, a sense of urgency and haste toward fertility treatment, and confusion about what the results actually mean for their individual situation.41Human Reproduction. Community awareness and use of anti-Müllerian hormone testing in Australia: a population survey of women Qualitative research on women who used direct-to-consumer tests found varying degrees of certainty about their results and the appropriate next steps, suggesting these tests may confound reproductive decision-making rather than clarify it.42PubMed. Quantifying fertility? Direct-to-consumer ovarian reserve testing and the new (in)fertility pipeline The test itself is straightforward. The interpretation, without a clinician who understands the limits of the marker, is where things go wrong. An AMH number without context is a number without meaning, and for many women trying to plan their reproductive futures, that incomplete picture causes more harm than the uncertainty it was supposed to resolve.