Serum human chorionic gonadotropin is a test used to diagnose early pregnancy. The presence of early pregnancy, intrauterine pregnancy, ectopic pregnancy or chorionic disorders are determined by serum human chorionic gonadotropin. Normally, in the absence of pregnancy, the chorionic gonadotropin in the body is in the range of 0-5ng/ml or 0-2.5ng/ml. Because the testing instruments are different and set different standards, as long as it is within the normal range, it means that there is no pregnancy. If it is greater than the standard value, there is a possibility of pregnancy. Normally, after pregnancy, the chorionic gonadotropin doubles every other day and rises gradually, a condition that indicates a relatively good early embryo. In the early stages, the normal development of the intrauterine embryo can be determined by the blood HCG, i.e., chorionic gonadotropin and progesterone, in the absence of ultrasound. If the HCG doubles badly, it suggests the possibility of ectopic pregnancy, or if the chorionic gonadotropin level is still high 1 month after abortion or medical abortion, it suggests a high possibility of chorionic disorders. Therefore, serum chorionic gonadotropin can tell if you are pregnant, diagnose if you probably have an ectopic pregnancy, and know if you have a chorionic disease.