Progesterone, or progesterone, is the progesterone hormone secreted by the ovaries that, along with estrogen, maintains normal menstruation as well as sustains pregnancy. For infertile women and pregnant women, progesterone has different values at different times. The progesterone of normal women also varies with the menstrual cycle, while the normal range of blood progesterone values for pregnant women will gradually increase as the pregnancy week grows. Specific performance is as follows: 1. follicular phase: normal value is 0.6-1.9 nmol/L; 2. ovulation phase: normal value is 2.4-9.4 nmol/L; 3. luteal phase: normal value is 20.7-102.4 nmol/L; 4. early pregnancy: normal value is 63.6-95.4 nmol/L; 5. mid pregnancy: normal value is 159-318 For infertile women, progesterone can maintain the stability and regularity of menstruation, and can improve the body’s immunity and protect the endometrium. In pregnant women, progesterone promotes the development of mammary gland follicles, inhibits uterine contractions and maintains a normal pregnancy. If the progesterone value is insufficient in early pregnancy, luteal insufficiency should be considered and the appropriate medication or injection should be taken according to the doctor’s diagnosis. When there is a drop in progesterone in a pregnant woman’s body, consider the possibility of pre-eclampsia miscarriage. However, due to different individual differences, each person’s progesterone value is different. Blood HCG test and gynecological ultrasound should also be performed to determine the pregnancy status.