AMH is made by the small, growing follicles (fluid-filled sacs that hold eggs) in the ovaries, so the level in blood roughly tracks how many eggs remain. Unlike FSH, it can be tested on any day of the cycle.
What a low AMH means — and what it doesn't
A low AMH suggests a smaller remaining egg pool and can predict a lower response to IVF stimulation (the hormone injections that grow eggs). It does not by itself mean pregnancy is impossible. It also says little about the quality of the eggs. A woman with low AMH and good egg quality can still conceive. As I tell my patients: low AMH can feel scary, but it's not the full story.
How it's used
AMH helps plan treatment. It guides the medicine dose for IVF stimulation, gives a realistic idea of how many eggs may be collected, and helps you decide about egg freezing if you want to delay pregnancy.