Ovarian reserve refers to the quantity and quality of a woman's eggs, which naturally decline with age.

It is assessed through biomarkers such as Anti-Müllerian Hormone (AMH) levels, antral follicle count (AFC), and follicle-stimulating hormone (FSH) levels.

A low ovarian reserve reduces fertility potential, making conception more difficult.

According to the American Society for Reproductive Medicine (ASRM), ovarian reserve reflects reproductive lifespan, with egg quantity decreasing progressively from birth and accelerating after the mid-30s.