The standard HCG blood value for twins after transplantation, at about 14 days after transplantation, blood can be drawn to test the chorionic gonadotropin level, if it is a twin fetus will be on 200IU/L there will also be individual differences. When a woman undergoes IVF transfer, two embryos will be transferred in order to increase the conception rate. If the HCG value in the blood is much higher, and it is not certain that it is a twin pregnancy, a gynecological ultrasound will be done about 10 days after the menstrual period is postponed, and there will be two gestational sacs in the uterine cavity and there are two fetal heartbeats, which is usually diagnosed as a twin pregnancy. However, the occurrence of twin pregnancies in women will also increase the occurrence of complications during pregnancy, such as twin transfusion syndrome, anemia in pregnancy, hypertensive disorders in pregnancy, etc. Regular review is needed to minimize and prevent complications to ensure the safety of mothers and children.