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Anti-Müllerian hormone (AMH)

Direct Marker of Ovarian Reserve

Anti-Müllerian hormone (AMH) is a hormone produced by reproductive tissues, including the testicles in males and the ovaries in females. The role of AMH and the amount normally present varies depending upon sex and age. The AMH level in young girls remains low until puberty, when the ovaries begin to produce it and levels increase.

AMH is important for a woman during her childbearing years. At birth, a female has about one million eggs (oocytes), which then decrease naturally in number during childhood to about 500,000. Only a tiny number of these remaining eggs will go through follicle maturation – one at a time as part of a woman’s monthly   menstrual cycle. AMH has a balancing effect on the   monthly cyclical actions of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) during the process of egg maturation and release (ovulation). The amount of AMH present is a reflection of this follicular growth.

Studies have shown that the AMH level may be useful in determining a woman’s remaining egg maturation potential (ovarian reserve) and her likelihood of conceiving. AMH declines over time during childbearing years, drops significantly as menopause approaches, and typically becomes almost undetectable after menopause. Determining the AMH level may be useful in evaluating a woman’s current fertility status and may predict the onset of menopause.