Progesterone, also known as luteinizing hormone, is a common progesterone secreted by the ovaries. After a woman becomes pregnant, progesterone will also change, usually increasing with the week of pregnancy. The normal reference values for different periods are as follows: 1. Progesterone in the follicular phase is between 0.6-1.9 nmol/L, while it increases after ovulation, usually between 20.7-102.4 nmol/L; 2. Progesterone in 4-6 weeks of pregnancy is between 19.4-95.3 nmol/L, in 6-7 weeks of pregnancy is 76.4±23.7 nmol/L; in 8 weeks of pregnancy is 89.2±24.6 nmol/L at 8 weeks of gestation, 118.6±40.6 nmol/L at 9-12 weeks of gestation; 98.3-185.7 nmol/L at 13-16 weeks of gestation, 153.8-241.2 nmol/L at 17-20 weeks of gestation; 234.6-457.4 nmol/L at 21-24 weeks of gestation; 403.4 at 25-34 weeks of gestation -626.2?nmol/L? and 483.6-776.8?nmol/L after 35 weeks of gestation. Progesterone levels are mainly related to the outcome of early pregnancy, and generally women with embryonic abortion and ectopic pregnancy have significantly lower serum progesterone levels than patients with preterm abortion and normal early pregnancy. Progesterone in the range of 15-25ng/mL has a pregnancy outcome that is basically intrauterine, but is prone to early preterm abortion. With progesterone less than 15ng/mL, the pregnancy outcome is more likely to be ectopic pregnancy or indolent abortion. If the progesterone is more than 25ng/mL, the pregnancy outcome is mostly normal intrauterine pregnancy, and some of them have pre-eclampsia abortion, but the pregnancy outcome can be continued after supplementation of luteal function. In conclusion, it is especially important to closely monitor progesterone indicators during pregnancy and it is recommended to pay sufficient attention to it. When the progesterone in pregnant women decreases or there is vaginal bleeding, the possibility of pre-eclampsia is considered, so you should go to the hospital for blood HCG test and gynecological ultrasound in time to determine whether the fetus is developing well.