The normal value of progesterone in the luteal phase is between 5-20ng/mL. Progesterone is secreted by the corpus luteum of the ovary, which can induce the endometrium to change from the proliferative phase to the secretory phase, prompting the onset of menstruation. Its secretion has its own regularity, the follicular phase is at a low level, in the pre-ovulatory luteinizing hormone peak after the secretion began to increase, after ovulation, the corpus luteum produces a large amount of progesterone, the concentration of which rises rapidly. After ovulation, the corpus luteum produces a large amount of progesterone, and the concentration rises rapidly. It reaches a peak when the corpus luteum matures, and then declines continuously, reaching the lowest level before menstruation. Progesterone values can be used to determine whether ovulation has occurred, to diagnose luteal insufficiency, and can be used to identify ectopic pregnancy. Luteal insufficiency is a common cause for women with premenstrual miscarriage. If it is caused by luteal insufficiency, progesterone preparations should be supplemented in time, such as progesterone gel pills and dydrogesterone can inhibit uterine contractions, which is conducive to the growth and development of the embryo, as well as having a tranquilizing effect.