Anti-Mullerian Hormone (AMH) is a blood test that measures anti-mullerian hormone (amh) levels in the blood. Normal range: AMH is strongly age-dependent and there is no single "normal" — broadly, 15-50 pmol/L is typical in the prime reproductive years (late 20s to early 30s), declining steadily towards menopause. Results above ~45-50 pmol/L can suggest PCOS. Always interpret against age-specific charts, as labs and assays vary.. It is commonly used to provides valuable information about ovarian reserve and fertility potential, helping with family planning decisions..
What is Anti-Mullerian Hormone (AMH)?
A hormone produced by the ovaries that indicates egg quantity.
Why is it measured?
Provides valuable information about ovarian reserve and fertility potential, helping with family planning decisions.
Normal Reference Range
AMH is strongly age-dependent and there is no single "normal" — broadly, 15-50 pmol/L is typical in the prime reproductive years (late 20s to early 30s), declining steadily towards menopause. Results above ~45-50 pmol/L can suggest PCOS. Always interpret against age-specific charts, as labs and assays vary.
Note: Reference ranges may vary between laboratories. Always consult your healthcare provider for interpretation.
What Causes High AMH?
A high AMH most commonly indicates polycystic ovary syndrome (PCOS), where many small follicles each produce AMH. Markedly high AMH supports a PCOS diagnosis alongside irregular cycles and signs of androgen excess. Rarely, very high levels can reflect a granulosa cell tumour of the ovary. A high AMH generally means a strong response to fertility (IVF) stimulation.
What Causes Low AMH?
Low AMH reflects reduced ovarian reserve (fewer remaining eggs). This is a normal part of ageing and rises sharply approaching menopause, but low-for-age levels can also follow chemotherapy or radiotherapy, ovarian surgery, endometriosis, or occur with primary ovarian insufficiency. A low AMH speaks to egg quantity and IVF response, not directly to natural fertility in a given month or to egg quality.
How Often Should AMH Be Tested?
AMH is stable across the menstrual cycle, so it can be tested on any day and is not affected by the combined pill in the long term (though current use can lower it modestly). It is usually checked when assessing fertility, planning IVF or egg freezing, or investigating suspected PCOS — repeated only if circumstances change.
Related Blood Markers
AMH is interpreted alongside FSH, LH and oestradiol (day 2-3 of the cycle) and an antral follicle count on ultrasound. In suspected PCOS, it is considered with testosterone, SHBG and the free androgen index.
Key Facts
- •Category: Hormone Health
- •Unit of Measurement: pmol/L
- •Test Code: AMH
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