What this marker measures
AMH is relatively stable across the menstrual cycle, which is why it has become the standard ovarian-reserve marker — unlike day-3 FSH, it does not require timed sampling.
High or low: what it can mean
High AMH
High AMH in females is seen in PCOS, where the ovaries contain many small follicles. Very high AMH can also occur with granulosa-cell tumours.
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Low AMH
Low AMH suggests diminished ovarian reserve and naturally declines with age, reaching very low values around menopause. Low AMH does not by itself preclude pregnancy but does predict reduced response to fertility treatment.
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Frequently asked questions
What is AMH?
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AMH is produced by small follicles in the ovaries (and by Sertoli cells in the testes). In adult females it is a key marker of ovarian reserve — the remaining pool of eggs.
What does AMH measure?
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AMH is relatively stable across the menstrual cycle, which is why it has become the standard ovarian-reserve marker — unlike day-3 FSH, it does not require timed sampling.
What does high AMH mean?
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High AMH in females is seen in PCOS, where the ovaries contain many small follicles. Very high AMH can also occur with granulosa-cell tumours.
What does low AMH mean?
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Low AMH suggests diminished ovarian reserve and naturally declines with age, reaching very low values around menopause. Low AMH does not by itself preclude pregnancy but does predict reduced response to fertility treatment.
Related biomarkers
Editorial note
LabTestly explains lab markers using plain-English educational content. Reference ranges may vary by laboratory and should be interpreted with a clinician.
Educational content · Editorially reviewed for clarity · Last updated
Common sources used for lab-test education
Not medical advice
This page is for general understanding only and does not replace medical advice from your clinician. Reference ranges can vary by laboratory, age, sex, pregnancy status, medications, and clinical context.