§ Biomarker · hormones

AMH low for age — what it means about ovarian reserve

hormones·1 min read·reviewed 2026-05-07

Anti-Müllerian hormone (AMH) is produced by granulosa cells of small ovarian follicles and reflects the size of the remaining follicle pool — i.e., 'ovarian reserve.' AMH declines steadily through reproductive life (peak ~25, near-zero at menopause) and a low AMH for your age range indicates diminished ovarian reserve relative to peers — meaning fewer eggs available for natural conception or IVF stimulation. AMH is the most stable marker of ovarian reserve (cycle-day independent, unlike FSH or oestradiol) and is the dominant predictor used in fertility clinics for IVF response prediction.

Reference ranges

Reproductive peak (25-30 yrs)	2.0 – 6.8 ng/mL (15 – 49 pmol/L)
Age 30-35	1.5 – 4.0 ng/mL
Age 35-40	1.0 – 3.0 ng/mL
Age 40-45	0.5 – 1.5 ng/mL
Diminished reserve threshold	< 1.0 ng/mL
Premature ovarian insufficiency	< 0.16 ng/mL

What this marker measures

AMH is produced by granulosa cells of pre-antral and small antral ovarian follicles. Because each follicle's AMH output is finite and the total AMH reflects the number of follicles, serum AMH is a direct quantitative readout of remaining follicle count. Unlike FSH (which fluctuates day-to-day and only rises late in reserve depletion), AMH falls smoothly across reproductive life and can be measured on any cycle day with a standard immunoassay.

Why might it be low?

·Age-related decline (the dominant factor)
·Premature ovarian insufficiency (POI) — autoimmune, genetic, or idiopathic
·Prior ovarian surgery (cyst removal, endometriosis surgery)
·Chemotherapy or pelvic radiation
·Smoking (accelerates ovarian ageing)
·BRCA1/2 mutations (associated with earlier reserve decline)
·Hormonal contraceptive use (transiently suppresses AMH ~25%)

Why might it be elevated?

·Polycystic ovary syndrome (PCOS) — many small follicles produce high AMH
·Granulosa cell tumours (rare)
·Recent ovarian stimulation

FAQ

Does low AMH mean I can't conceive?+

Not necessarily. AMH reflects follicle quantity, not quality — a woman with low AMH can still ovulate fertile eggs. It does mean the window is narrower (fewer eggs total over time, less response to IVF stimulation). Direct natural-conception predictive value is moderate; IVF response predictive value is high.

Can lifestyle improve AMH?+

Limited literature support. Smoking cessation, vitamin D correction (where deficient), DHEA supplementation in select cases (controversial), and CoQ10 / mitochondrial support have small to modest associations in some research. The dominant determinant remains chronological age.

Disclaimer

This page describes biomarker research and reference ranges for self-tracking and research-context discussion only. It is not medical advice, not a diagnosis, and not a substitute for a qualified physician. Take any concerns about your health to a clinician.

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