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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.
The phase before ovulation, when the ovarian follicles are developing, is called the follicular phase. The phase after ovulation is called the luteal phase. The length of the follicular phase may vary but the luteal phase length is generally constant from cycle to cycle for the same woman, lasting 10-16 days.