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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.
The normal luteal phase length from ovulation to menses ranges from 11 to 17 days with most luteal phases lasting 12 to 14 days. One proposed diagnostic criteria for LPD is a shortened luteal phase of less than 9 days.