Anti Müllerian hormone, secreted by small ovarian follicles, is the standard blood marker of remaining egg supply. This interpreter converts between the two reporting units, nanograms per milliliter and picomoles per liter, which differ by a factor of about seven, and places the result in its usual band, low below one, typical between one and three and a half, high above.
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Every woman is born with her lifetime egg supply, and AMH offers the best available blood estimate of how much of that reserve remains. Small follicles in the ovary secrete it steadily, so unlike most fertility hormones it can be drawn any day of the cycle, one reason it became the default first test in fertility workups.
Reading the Bands
Below one nanogram per milliliter suggests diminished reserve, roughly seven picomoles in SI units. One to three and a half is the typical range for the fertile years, and levels above three and a half to four often accompany polycystic ovary syndrome, where many small follicles collectively overproduce. Values decline with age, from typical peaks in the mid twenties toward undetectable at menopause.
What AMH Does Not Say
The TIME study and follow up work delivered the crucial nuance, AMH predicts egg quantity, not natural conception probability. Women with low AMH conceived at similar rates to others over a year of trying, because quality and ovulation matter independently. Where AMH genuinely steers care is IVF planning, forecasting how ovaries will respond to stimulation and shaping drug doses.
Unit Confusion Is Common
Laboratories report either nanograms per milliliter or picomoles per liter, multiplied by seven point one four to convert from the former. Comparing results across systems without converting has caused real clinical confusion, so always check which unit your report uses before reading any band.
A single low result deserves confirmation and context, not despair. Repeat testing, ultrasound follicle counts and age together paint the picture AMH only sketches.