Luteal Phase Deficiency (LPD) is a condition characterized by inadequate function of the luteal phase of the menstrual cycle. The luteal phase is the period between ovulation and the start of menstruation, typically lasting around 12-14 days. This phase is critical for the preparation of the endometrium for potential implantation of an embryo. In LPD, there is insufficient production of progesterone, which can lead to issues with implantation and early pregnancy loss.
