The normal value of chorionic gonadotropin is less than 75 U/ml and more than 150 U/ml may be pregnancy. Since each hospital uses different reagents, the reference value varies greatly. Generally, the reference value of the local hospital prevails, and exceeding the reference value indicates the possibility of pregnancy, and within the reference value is negative. Chorionic gonadotropin, abbreviated as HCG, is a glycoprotein secreted by the trophoblast cells of the placental syncytium. After fertilization, the fertilized egg moves to the uterine cavity and lays, and during the formation of the embryo, the placental syncytiotrophoblast cells secrete a large amount of HCG, which is excreted into the urine with the blood circulation of the pregnant woman. The HCG level in the serum and urine can rise rapidly at 1-2.5 weeks of pregnancy, and can reach a peak at 8 weeks of pregnancy, drop to an intermediate level at about 4 months of pregnancy, and then be maintained until the end of pregnancy. Clinically, besides pregnancy, there are other diseases in which high chorionic gonadotropin indicators can be seen, such as staphyloma, malignant staphyloma, chorionic epithelial cell carcinoma, seminoma, teratoma, gastric cancer, pancreatic cancer, lung cancer, colon cancer, liver cancer, ovarian cancer, and carcinoid tumors of the digestive system. If the chorionic gonadotropin index is higher than normal, it needs to be combined with the history of menopause and ultrasound examination, etc. to make a clear diagnosis.