Anti-Müllerian hormone (AMH)

On this page

1. What is AMH?
2. Where is AMH produced?
3. Function of AMH
4. Normal AMH levels
5. AMH levels by age
6. Causes of low AMH
7. Causes of high AMH
8. When and how to test AMH
9. AMH trends over time — what "declining" actually means
10. AMH in traditional Chinese medicine
11. Acupuncture and AMH
12. Chinese herbal medicine and AMH
13. Diet, supplements and lifestyle
14. My Fertility Guide
15. Related pages

1. What is AMH?

Anti-Müllerian hormone (AMH) is a glycoprotein hormone produced by the granulosa cells of small developing follicles in the ovary. It has become the most accurate single marker of ovarian reserve — the quantitative measure of how many eggs a woman has remaining. AMH has largely replaced FSH as the primary marker of ovarian reserve because it is more stable across the menstrual cycle, can be tested at any time, and more directly reflects the size of the follicle pool.

AMH is a measure of egg quantity, not egg quality. A woman with a low AMH may still have good-quality eggs and conceive naturally; conversely, a woman with a high AMH (such as in PCOS) may have poor egg quality despite plentiful follicles.

Reference ranges vary from country to country and between laboratories. Different units are used (ng/mL, pmol/L) and different assay methods give slightly different results. Always interpret your own AMH result against the laboratory's own reference range, and ideally test in the same laboratory each time to allow direct comparison.

2. Where is AMH produced?

AMH is produced by the granulosa cells of pre-antral and small antral follicles in the ovary. Each follicle that is recruited towards ovulation contributes a small amount of AMH; the total measured in the blood is therefore proportional to the size of the developing follicle pool. AMH is also produced by Sertoli cells in the male testis, where it has a different role in fetal development of the male reproductive tract.

3. Function of AMH

In adult women, AMH appears to act as a "brake" on follicle recruitment, limiting the number of follicles that respond to FSH each cycle. This is one of the mechanisms by which the ovaries conserve their finite supply of eggs over the reproductive years.

For clinical purposes, AMH is mainly used as a marker of ovarian reserve and a predictor of response to ovarian stimulation in IVF.

4. Normal AMH levels

The following are general guides drawn from UK and international literature:

Reference ranges vary from country to country and between laboratories. The values above are general guides — always interpret your own result against the laboratory's reference range. To convert ng/mL to pmol/L, multiply by 7.14.

5. AMH levels by age

AMH declines progressively with age. The following table shows typical AMH levels by age:

These are population averages — individual women vary considerably. A woman with an AMH below the average for her age can still conceive naturally; it only takes one good-quality egg.

6. Causes of low AMH

Low AMH is caused by:

1. Ageing — the most common cause; AMH falls progressively from around age 30.
2. Premature ovarian failure or insufficiency.
3. Genetic factors — including Fragile X premutation and Turner syndrome.
4. Previous ovarian surgery — particularly removal of an ovary or treatment of endometriomas.
5. Chemotherapy and radiation.
6. Smoking — research has shown reduced AMH in women exposed to cigarette smoke or wood smoke.
7. Severe nutritional deficiency and chronic illness.

7. Causes of high AMH

High AMH is most commonly seen in PCOS, where the ovaries contain a large number of small follicles each producing AMH. Recent research has shown that acupuncture can reduce and normalise high AMH levels in women with PCOS.

8. When and how to test AMH

AMH can be tested at any point in the menstrual cycle, although recent research suggests levels are slightly higher in the first half of the cycle before ovulation. AMH is unaffected by oral contraceptives in the long term, but levels can be transiently lower in women on combined hormonal contraceptives, so retesting after stopping is sometimes advisable. AMH is more stable than FSH from cycle to cycle, but levels can fluctuate, so retesting after three months is reasonable if a result is unexpected.

Reference ranges vary from country to country. Always interpret your own result against the laboratory's reference range and discuss it with your doctor.

9. AMH trends over time — what "declining" actually means

Patients often come to clinic worried by a fall in AMH between two tests — sometimes a substantial one on paper (say, 12 to 8 pmol/L over 18 months) — and want to know what it means. The honest answer requires unpacking several things that get conflated in fertility-clinic conversations.

AMH is expected to fall — the question is how fast

Population data show that AMH declines steadily from around age 25 onwards, with the rate accelerating in the mid-30s and again in the early 40s. A rough shorthand from the epidemiological data is that AMH halves roughly every 5–7 years across the reproductive years, though individuals vary enormously. A single "declining" reading over an interval of a year or two is, on its own, only what would be expected.

What matters clinically is the rate of decline relative to age. A woman of 32 whose AMH drops steeply from a healthy starting point in 18 months is a different clinical situation from a woman of 42 whose AMH drops steadily in a way consistent with population averages. The first prompts investigation and expedites treatment planning; the second is often a normal trajectory that does not require intervention beyond ongoing conception attempts and, where relevant, IVF timing decisions.

Assay noise and inter-lab variability

The single most common cause of an apparently alarming AMH drop is not biology but methodology. AMH is measured by different immunoassays with meaningfully different calibrations. Two labs testing the same blood sample can produce results that differ by 20–30% — not because the AMH is different, but because the assay is. This is why any before-and-after comparison of AMH needs to be from the same laboratory using the same assay. A large-looking drop between two different labs may partly or entirely be assay drift rather than biology.

Even within a single lab, day-to-day biological variation of 10–20% is normal. A single result should not be over-interpreted; a trend across three time points is much more informative than the difference between two.

Reversible causes of a temporary AMH dip

Several conditions transiently depress AMH readings and can normalise once addressed:

• Combined hormonal contraceptives. Long-term use of the combined pill can lower AMH readings by 20–30%; AMH typically recovers within 3–6 months of stopping. A worried patient who has just stopped the pill should have their AMH re-tested after a full three-month gap before drawing conclusions.
• Recent ovarian surgery. Cystectomy, endometrioma removal or ovarian drilling can drop AMH sharply. Some recovery over 6–12 months is expected.
• Vitamin D deficiency. Emerging data suggest low vitamin D correlates with lower AMH; supplementation to an optimal level may modestly improve readings in some patients.
• Severe stress, weight loss, restrictive dieting. Extreme reductions in body-fat percentage and severe nutrient depletion can suppress AMH transiently.
• Recent COVID-19 or other significant illness. Some acute inflammatory states appear to depress AMH readings temporarily.
• PCOS transitioning. High AMH in PCOS may fall as PCOS is treated (weight, insulin sensitivity, TCM support) — this is a favourable, not concerning, change.

What the trend does not tell you

An AMH trend cannot predict:

• Whether you will conceive naturally in a given cycle — AMH measures reserve, not egg quality or fertilisability.
• Exactly when you will reach menopause — population averages exist but individual prediction has wide confidence intervals.
• Whether IVF will succeed — low AMH predicts fewer eggs at collection but does not directly predict per-embryo pregnancy chance, which is more related to egg quality (which is more closely age-dependent than AMH-dependent).

The clinical use of a trend

Where an AMH trend is genuinely useful:

• Guiding IVF timing decisions. A steep fall over 6–12 months, confirmed on same-lab retesting, argues for expediting treatment rather than deferring.
• Investigating premature ovarian insufficiency (POI). AMH under 1 pmol/L or 0.14 ng/mL, particularly in a woman under 40 or with irregular cycles, warrants further assessment — hormonal profile, karyotype, autoimmune screen. See our page on premature ovarian failure.
• Monitoring effect of interventions. Where treatment (DHEA, CoQ10, acupuncture, lifestyle) is trialled specifically to support ovarian reserve, a same-lab AMH at 3 and 6 months is a reasonable objective marker — though symptomatic and menstrual-cycle changes often shift before AMH does.
• Documenting recovery. After chemotherapy or ovarian surgery, tracking AMH recovery through the years post-treatment.

What to ask your fertility clinic

When comparing two AMH readings that concern you, useful questions are:

• Were both tests done in the same laboratory using the same assay?
• What is the reference range and units used in each result?
• How does the rate of change compare with what would be expected for my age?
• Does the antral follicle count on ultrasound agree with the AMH trend?
• Is there a reversible factor that could explain any of the fall (medication, surgery, stress, illness)?

These questions turn a worrying number into a useful clinical picture. AMH is a valuable test but a single reading is a small window; the trend, correctly interpreted, is more useful still. See also our page on low AMH and the broader how to improve egg quality guide for what to do next when a trend is genuinely concerning.

10. AMH in traditional Chinese medicine

In traditional Chinese medicine, AMH most closely corresponds to Kidney Jing (essence) — the foundational, deep, finite reserve that governs reproductive maturation, fertility and longevity. Low AMH reflects Kidney Jing deficiency, often combined with Kidney Yin and Blood deficiency. Symptoms typically include lower back ache, dark circles under the eyes, premature greying of the hair, dry skin and a sense of physical depletion.

11. Acupuncture and AMH

Acupuncture has been shown in research to improve ovarian reserve, increase antral follicle count and reduce high AMH in women with PCOS. By improving ovarian blood flow, regulating the HPO axis and reducing oxidative stress, acupuncture provides whole-system support to the ovary. Treatment is typically weekly for at least three to four months — the time needed for follicles to mature from primordial to ovulation.

See my dedicated page on low AMH level for full clinical detail and patient experience.

12. Chinese herbal medicine and AMH

Chinese herbal formulae that nourish Kidney Jing, Yin and Blood are used to support women with low AMH. Examples include Zuo Gui Wan, Yu Lin Zhu, Gui Lu Er Xian Jiao and Wu Zi Yan Zong Wan. Where Liver Qi stagnation from chronic stress is also present, Xiao Yao San is added. For high AMH in PCOS, formulae such as Cang Fu Dao Tan Tang are used.

13. Diet, supplements and lifestyle

To support healthy AMH and ovarian reserve:

1. Take a good-quality prenatal supplement.
2. Consider DHEA (25–75 mg/day) under professional guidance — research has shown it can improve egg quality and ovarian response.
3. Coenzyme Q10 (600 mg/day) — supports mitochondrial function in the egg.
4. Royal jelly and bee pollen — traditionally used to nourish Jing.
5. Melatonin (3 mg at night) — a powerful antioxidant that protects egg quality.
6. Eat plenty of iron- and protein-rich foods.
7. Avoid smoking and exposure to second-hand smoke.
8. Sleep before 10 p.m.
9. Reduce psychological stress.

14. My Fertility Guide

15. Related pages

• Fertility hormones directory
• Follicle stimulating hormone (FSH)
• Dehydroepiandrosterone (DHEA)
• Oestrogens
• Low AMH level (clinical page)
• Premature ovarian failure
• PCOS