AMH

AMH is anti-Müllerian hormone, a blood test used to estimate how many eggs are left in the ovaries. It is a headcount rather than a quality score, and it is an excellent guide to how you will respond to stimulation drugs, though not to whether you can have a baby.

Where you'll meet it

AMH turns up early, often before anyone has examined you. It is part of the standard ovarian reserve workup, it is sold direct to consumers as a home fertility test, and it is one of the numbers people most often compare. Clinics use it to choose a drug dose before an IVF or egg freezing cycle.

What it actually measures

Anti-Müllerian hormone is made by the small resting follicles sitting in the ovary waiting their turn. The more of those there are, the more hormone there is in the blood. So the test is an indirect count of the pool, and it maps reasonably well onto the antral follicle count seen on ultrasound.

It is a convenient test because the level barely moves across the menstrual cycle, so the blood can be drawn on any day. That convenience is a large part of why it displaced the older day-three hormone tests.

Results come back in different units depending on the laboratory, which is why the same sample can produce two numbers that look nothing alike. Ask which units yours is in before comparing it with anything you read.

What a low result does and does not mean

A low AMH means the reserve is smaller than average for your age. It does not mean you cannot conceive naturally, and it is not a verdict on the quality of the eggs you do have. Quality tracks age, and age is not what this test measures. Two women with the same AMH and ten years between them have very different odds, and the number on the page is identical.

What a low result does predict is a smaller harvest from a stimulated cycle. Fewer follicles, fewer eggs, fewer embryos. That is a genuinely useful thing to know if treatment is on the table, because it shapes the drug dose and it shapes how many cycles to plan for.

A high result carries its own meaning. Very high AMH is common in polycystic ovaries and flags a higher risk of overstimulation, which is a reason for a gentler protocol rather than a stronger one.

Reading it in context

The result is most useful when a clinician reads it with you. A number on its own, without your age and history beside it, can look far more alarming than it is, and read properly it often changes nothing about your plan. If you test direct-to-consumer, book a conversation to go with it.

AMH is also not a reliable guide to when your menopause will be. Treat it as one input into a conversation, not as a countdown.

Questions to ask

Ask what your result means for the drug dose and the likely egg number rather than for your chances of a baby. Ask whether the clinic wants an antral follicle count alongside it, since the two are normally read together and either one alone moves around more than you would like. If the result is low and you were planning to wait, that is worth a calm, proper conversation about timing.

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