Anti-Müllerian Hormone
A hormone from small ovarian follicles that reflects the remaining egg supply (ovarian reserve).
What it measures
AMH is produced by granulosa cells of small, growing follicles in the ovaries (and by Sertoli cells in males before puberty). Levels correlate with the number of remaining follicles and decline with age.
Why it matters
AMH is the leading marker of ovarian reserve, used to estimate response to IVF stimulation and approximate the timing of menopause. It does not predict natural fertility in the short term.
What a high result can mean
High AMH is commonly associated with PCOS (many small follicles) and, rarely, granulosa cell tumors.
What a low result can mean
Low AMH indicates reduced ovarian reserve, as occurs with age, after ovarian surgery or chemotherapy, and in primary ovarian insufficiency. Hormonal contraceptives can temporarily lower AMH by 20-30%.
What affects the result
Can be measured on any cycle day. Interpretation is strongly age-dependent (e.g. roughly 1.5-4 ng/mL in the early 30s), so no single adult range applies. Vitamin D deficiency and smoking may lower it.
Units and conversion
Usually reported in ng/mL.
- From pmol/L: multiply by 0.14 to get ng/mL
Also called on lab reports
AMH, Anti-Mullerian Hormone, Antimullerian Hormone, Mullerian Inhibiting Substance, Antimullerian Hormone (AMH)
Related tests: Sex Hormones
This page is educational and does not replace advice from a healthcare professional.