Published on:
March 30, 2026
AMH stands for anti-Müllerian hormone, a protein produced by the granulosa cells that surround each developing follicle in your ovaries. Each follicle contains an immature egg, and the level of AMH circulating in your blood gives doctors a measurable snapshot of how many growing follicles you have at any point in time. That follicle count is referred to as your ovarian reserve — a term you will see throughout fertility medicine.
Your body begins producing AMH from the primary follicle stage, well before a follicle is selected for ovulation in a given menstrual cycle. Because of this early production, AMH levels stay relatively stable throughout the month, making the test convenient: you can have blood drawn on any day of your cycle and still receive a reliable reading.
AMH gained clinical prominence in the early 2000s as fertility specialists searched for a single, reproducible marker of egg quantity. Before AMH testing became widely available, clinicians relied heavily on day-three FSH (follicle-stimulating hormone) levels and antral follicle counts via ultrasound. Both remain useful, but AMH added a layer of precision — particularly for women considering IVF or those wanting a general sense of their reproductive timeline.
AMH levels follow a predictable arc across a woman's life. Concentrations start rising after birth, reach their peak around age 25, and then begin a gradual decline after 30. By the time most women reach their early 40s, AMH levels have dropped substantially. After menopause, AMH becomes undetectable because the ovaries no longer contain growing follicles.
This age-related decline mirrors the biological reality that women are born with a finite pool of eggs — roughly one to two million at birth, declining to around 300,000 by puberty. No new eggs are created afterwards. Each month, a cohort of follicles is recruited, most of which will not reach ovulation and are reabsorbed. AMH reflects the size of that remaining recruitable pool.
Knowing where your AMH sits relative to others of the same age can be helpful, but two women aged 32 can have very different AMH levels. Genetics, ethnicity, body mass index, smoking status, and conditions such as polycystic ovary syndrome (PCOS) all influence the number. That is why AMH should always be interpreted alongside your full clinical picture, not in isolation.
Laboratories report AMH in either pmol/L or ng/mL. A commonly cited classification in ng/mL is:
These thresholds vary slightly between laboratories, so compare your result against the reference range printed on your specific report.
A common misconception is that AMH predicts whether you can get pregnant naturally. It does not. AMH measures quantity — the approximate number of eggs remaining — but says little about quality. Egg quality is overwhelmingly determined by age. A 28-year-old woman with a low AMH still has statistically better egg quality than a 40-year-old woman with a normal AMH.
AMH also cannot tell you when you will reach menopause with any useful precision. While a very low AMH in a younger woman might suggest an earlier-than-average menopause, the test is not validated as a menopause predictor for individual patients. If you are experiencing symptoms such as irregular periods, hot flushes, or sleep disturbance, you may want to explore whether perimenopause could be a factor, regardless of your AMH result.
Not every woman needs an AMH test. However, several groups may benefit from knowing their level:
If you think an AMH test might be useful for you, your GP or gynaecologist can arrange it as part of a broader blood test panel that may also include FSH, oestradiol, thyroid function, and prolactin levels.
The test itself is straightforward. A healthcare professional draws a small blood sample from a vein in your arm, exactly as with any routine blood test. There is no fasting requirement, no special preparation, and — unlike FSH testing — no need to time the draw to a particular day of your menstrual cycle.
Results typically take a few days to return from the laboratory. Your clinician will then discuss the result in the context of your age, medical history, and reproductive goals. A single number on a page rarely gives the full picture, so expect a conversation rather than a quick verdict.
If your result is lower than expected, try not to panic. A low AMH does not mean you cannot conceive. Many women with low AMH conceive naturally, particularly if they are under 35 and ovulating regularly. What a low result can do is prompt you and your doctor to move more quickly with further investigations or treatment if you are actively trying to conceive. For some women, that early prompt is the most valuable thing the test provides.
In IVF clinics, AMH occupies a central role in treatment planning. A woman with a high AMH and a large antral follicle count will likely produce many eggs during a stimulation cycle, so her specialist may use a lower dose of gonadotropins to reduce the risk of ovarian hyperstimulation. A woman with a low AMH may receive a higher dose, or the team may discuss alternative protocols designed to maximise yield from a smaller follicle pool.
Research consistently shows that AMH predicts the number of eggs collected during IVF, but it is a weaker predictor of whether any single cycle will result in a live birth. That distinction matters. You can retrieve 20 eggs and have no viable embryo, or retrieve three eggs and have one excellent embryo that leads to a healthy pregnancy. Quality — which correlates most closely with maternal age — remains the decisive variable.
For women diagnosed with infertility, AMH testing forms part of a broader diagnostic workup. Your doctor will also examine tubal patency, uterine anatomy, ovulation patterns, and your partner's semen analysis. AMH offers one piece of a larger puzzle.
PCOS is the most well-known condition associated with elevated AMH. The excess small antral follicles characteristic of PCOS each produce AMH, inflating the total. Endometriosis, particularly ovarian endometriomas, can damage ovarian tissue and lead to a lower AMH than would otherwise be expected for a woman's age.
Smoking accelerates follicle loss and is associated with lower AMH levels. Vitamin D deficiency has been linked to lower AMH in some studies, though the clinical significance of that relationship is still debated. Obesity may also influence AMH measurements, with some research suggesting that higher BMI is associated with slightly lower AMH — though the mechanism is not fully understood.
Combined oral contraceptive pills and other hormonal contraceptives can suppress AMH levels while you are taking them. If you stop the pill and test immediately, your AMH may read lower than your true baseline. Most specialists recommend waiting at least two to three months after stopping hormonal contraception before interpreting an AMH result as representative of your underlying reserve.
Any surgical procedure that removes ovarian tissue — such as cystectomy for an endometrioma — will reduce the follicle pool and therefore reduce AMH. This decline is sometimes temporary but can be permanent, depending on how much tissue was removed.
This is one of the most common questions women ask after receiving a low result. The short answer is: no intervention has been proven to raise AMH in a meaningful, lasting way. AMH reflects the number of growing follicles, and you cannot create new eggs.
Some supplement companies market DHEA, CoQ10, or vitamin D as AMH boosters. While there is preliminary evidence that DHEA supplementation may modestly improve IVF outcomes in some women with diminished ovarian reserve, it has not been shown to raise AMH itself in a clinically significant manner. CoQ10 may support mitochondrial function in ageing eggs, potentially improving quality rather than quantity, though robust evidence is still limited. Discuss any supplements with your doctor before starting them, particularly if you have hormone-sensitive conditions.
What you can do is address modifiable risk factors. Quitting smoking, maintaining a healthy weight, and managing stress may help preserve existing ovarian function — though none of these will reverse the biological clock. The most impactful decision for many women is acting on the information promptly: if your reserve is lower than expected and you want children, speaking to a fertility specialist sooner rather than later can make a tangible difference to your options.
Yes. Unlike FSH or oestradiol, which fluctuate across the cycle, AMH remains relatively stable throughout the month. You can book your blood draw on whichever day suits you without worrying about timing.
No. A low AMH indicates a reduced number of remaining eggs, but it does not determine whether you can conceive. Women with low AMH conceive naturally every day, especially when they are younger and ovulating regularly. The result may, however, suggest you should seek fertility advice earlier rather than waiting.
AMH testing is sometimes available on the NHS as part of a fertility investigation, but access varies by area and clinical indication. Many women choose to have the test done privately for faster results and greater flexibility. Your GP can advise on the best route for your circumstances.
Both are hormones used to assess ovarian function, but they measure different things. AMH reflects the pool of growing follicles and remains stable across the cycle. FSH, produced by the pituitary gland, rises when the ovaries need more stimulation — so a high FSH on day three of your cycle can indicate diminished reserve. Clinicians often use both tests together for a more complete picture.
No. AMH is a marker of egg quantity, not quality. Egg quality is most closely linked to your age. A younger woman with low AMH may still have excellent-quality eggs, while an older woman with normal AMH may face age-related quality decline.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for personalised diagnosis and treatment. If you have concerns about your fertility or hormonal health, please speak to your GP or a specialist.
The information provided in this article is for educational purposes only and is based on NHS recommendations. It is not a substitute for professional medical advice. Always consult your doctor or a qualified healthcare provider for advice on medical conditions or treatments.
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