Ovarian reserve refers to the number and quality of eggs present in a woman's ovaries at any given time. It is an important factor in female fertility, as it indicates how many viable eggs are available for potential fertilization. Ovarian reserve naturally declines with age, particularly after the age of 35, which can affect a woman's ability to conceive. Healthcare providers often assess ovarian reserve through various tests, including ultrasound examinations and blood tests measuring hormone levels like AMH (anti-Müllerian hormone). Understanding ovarian reserve can help women make informed decisions about family planning and fertility treatments.