What is AMH and why test it?
AMH — anti-Müllerian hormone — is produced by the small, developing follicles in the ovaries, so a blood test for it gives a rough sense of how many of those follicles are present. It's often raised in PCOS, which is why it comes up in that context — but it is not a fertility verdict, and a raised result isn't a diagnosis on its own.
What AMH measures, and why it's raised in PCOS
Because AMH is released by small follicles, the test reflects follicle numbers rather than overall health or fertility. PCOS often involves a higher number of these follicles, so AMH tends to be higher in many women with the condition — which is why it's discussed alongside the ultrasound and hormone tests used in assessment. It's a single measurement from one moment, and reference ranges vary between labs and assays, so there's no universal figure that means 'PCOS', and we don't quote one. Your result is read against your own lab's range.
What AMH doesn't tell you
A raised AMH is widely misread as a fertility score. It isn't. AMH reflects follicle numbers, not whether or when you can conceive, and on its own it isn't a diagnosis — it's one signal a clinician weighs with everything else. If fertility is your concern, that's a conversation for a clinician who can look at the full picture, not something to read off a single number.
PCOS Diary stores each AMH result in a dated lab vault, so a later reading sits next to earlier ones as a trend in your doctor-ready PDF.
Common questions
- Does a high AMH mean I definitely have PCOS?
- No. AMH is often raised in PCOS, but it's one signal among several and isn't diagnostic on its own. Reference ranges vary by lab, and a clinician reads AMH alongside your symptoms, ultrasound and other tests.
- Does AMH tell me about my fertility?
- AMH reflects ovarian follicle numbers, not whether or when you can conceive. It's commonly misread as a fertility score. If fertility is your concern, that's a conversation for a clinician who can look at the full picture.
- Is one AMH result enough, or is it worth keeping for later?
- AMH is a single measurement from one moment, read against your own lab's range, so on its own it's a snapshot rather than a story. Keeping it dated, with the lab noted, means that if it's checked again later a clinician can see it next to the earlier reading instead of treating each in isolation — and it sits in the same place as your symptoms and cycle, where it belongs as one signal among several. That context is also what guards against reading a single AMH figure as a verdict it was never meant to be.