Chorionic gonadotropin, or HCG, has a value of 5-50 mIU/ml, indicating possible pregnancy, and a chorionic gonadotropin value greater than 50 mIU/ml can be diagnosed as pregnancy. After fertilization until the 8th week of pregnancy, the HCG value of a pregnant woman increases rapidly, and at about 30 days of pregnancy, the HCG value usually doubles every other day, which is an indicator to determine whether the pregnancy is normal or not. If the HCG rises too slowly or even declines gradually after pregnancy, it may be a sign of embryonic dysplasia or the possibility of preterm miscarriage or stillbirth. In the treatment of pregnancy preservation, if the HCG value rises, it means that the preservation is successful, but if the HCG rises slowly or even continues to fall, it means that the preservation has failed. If the rise of chorionic gonadotropin is too fast, greater than 100000mIU/ml or more be alert to the possibility of diseases such as staphyloma and chorioepithelial carcinoma. However, in case of ectopic pregnancy, HCG test still has 60% chance of indicating pregnancy, but it does not exclude the possibility of ectopic pregnancy, so it is necessary to determine whether it is ectopic pregnancy with the help of gynecological ultrasound examination. However, in case of bleeding after ectopic pregnancy accompanied by acute abdominal pain and other symptoms, HCG test can help to exclude the presence of other diseases, such as acute gastroenteritis and appendicitis.