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Luteal phase. The luteal phase is the latter phase of the menstrual cycle (in humans and a few other animals) or the earlier phase of the estrous cycle (in other placental mammals). It begins with the formation of the corpus luteum and ends in either pregnancy or luteolysis.
Practically, the luteal phase length(LPL) is the number of days from the. day after ovulation to the day before menses. The normal range is. usually 12 to 16 days, with an average of 14 days.