The anti-Müllerian hormone (AMH) or Müllerian inhibiting hormone is a hormone that can be detected in the blood. It is at high levels in male children but drops at puberty, while in women it is absent during childhood and rises at puberty, dropping again as menopause approaches.
Changes in the level of this hormone, which is produced in the testes and ovaries respectively, may be responsible for the onset of puberty.
AMH may also be used as a test to assess the number of eggs (ova) a woman has in her ovaries. A low level indicates that the woman’s egg supply is low and she may be approaching menopause. On the other hand, a very high level can indicate ovarian abnormalities such as the polycystic ovarian syndrome. The test must be done after any use of oral contraceptives or other hormone supplements has ceased.
The normal level in a fertile woman is 0.9 to 2.5 ng/mL