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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.
On average, the luteal phase is between 12 and 14 days. However, it can be as short as 8 days and as long as 16 days. Whatever your regular luteal phase length is, itâll tend to be consistently that length every cycle. So, for example, a woman whose luteal phase tends to be 12 days will always be 11 to 13 days long.