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The selected follicle grows to be about 20 mm in diameter, or about the size of a large grape. This process takes about two weeks and culminates in ovulation. The body triggers ovulation by releasing a hormone called luteinizing hormone, or LH. This hormone is readily measured in the urine some 12 to 24 hours prior to the release of the egg. Commercially available ovulation detection kits are based on the measurement of LH.
At puberty each ovary has a large number of immature follicles (primordial follicles), each of which contains an undeveloped egg cell. About every 28 days between puberty and the onset of menopause, one of the follicles develops to maturity, or ripens, into a graafian follicle (or vesicular ovarian follicle).