AMH is a protein hormone that’s produced by special cells inside your follicles. AMH levels in the blood help us to estimate the total number of follicles inside the ovaries, and from there calculate your total egg count. AMH levels stay constant throughout your menstrual cycle, so a simple blood test can be taken at any time during the month.
A typical AMH level for a fertile woman is greater than 16.2 pmol/L, under 4.9 pmol/L is considered very low and indicative of a reduced ovarian reserve.
Healthy AMH ranges by age
The reference intervals below are derived from a population of apparently healthy women not taking any contraceptive medication. The reference intervals represent the 10th – 90th percentile values for the women in each age bracket.
Elecsys AMH (pmol/L)
20 – 29 years
13.1 – 53.8
30 – 34 years
6.8 – 47.8
35 – 39 years
5.5 – 37.4
40 – 44 years
0.7 – 21.2
45 – 50 years
0.3 – 14.7
AMH gives a good indication of what your reserve looks like on the day of the test. It doesn’t predict whether you might be able to get pregnant naturally in the future, and it doesn’t mean that if your results indicate you have a ‘low egg count’ you can’t get pregnant without help. But it may indicate this might be more difficult for you.
Equally, if you have a ‘normal’ result right now, the levels may not stay the same in the future. Fertility declines with age in all women, and how rapid that decline varies between women and is impossible to predict.
Low AMH levels might mean that the ovaries may not respond well to fertility medications in an egg freezing or IVF cycle, and so higher doses of the stimulation medications might be needed, or multiple stimulation cycles might be required in order to collect a good number of eggs. It may also affect your doctor’s guidance as to whether you are a good candidate for egg collection and freezing.
Exceptionally high AMH levels can be an indicator of polycystic ovarian syndrome (PCOS). If this is the case, lower doses of hormones are usually used to get a good number of eggs without risking over-stimulation. Being more responsive to stimulation hormones puts you more at risk of ovarian hyperstimulation syndrome (OHSS), a risk that needs to be managed very carefully throughout any planned treatment.