Transfer generally refers to embryo transfer, and an HCG of 300 mIU/mL or more 14 days after embryo transfer is considered a safe situation. Embryo transfer is a technique in which sperm and egg combine outside the body to form a fertilized egg, which is then transferred to the woman’s uterus after a period of in vitro culture. If the embryo transfer is successful, the HCG concentration in the woman’s body will rise significantly, and it is considered safe to exceed 300mIU/mL at 14 days after the transfer. a normal rise in HCG concentration indicates that the embryo is developing well in the uterus. HCG concentrations below 100 mIU/mL may be the result of a failed embryo transfer, and some women may be prescribed fertility preservation therapy to promote embryo development through artificial treatment. Women undergoing embryo transfer should maintain a good state of mind, get enough sleep, avoid overwork and anxiety, and consult a doctor immediately if there is any discomfort.