Generally, it is normal for HCG to be 50~500IU/L for 16 days of frozen embryo transfer, but there will be individual differences. Frozen embryo transfer refers to in vitro fertilization-embryo transfer technique, which is a kind of artificial assisted reproduction technique and needs to be operated by professional physicians. Generally, blood HCG (human chorionic gonadotropin) level is measured about 2 weeks after the frozen embryo transfer to confirm pregnancy, and it is normal for the blood HCG level to be 50~500IU/L when the frozen embryo transfer is 16 days old, but there are some individual variations. After the frozen embryo transfer, it is necessary to pay attention to reduce the activities appropriately, but do not need absolute bed rest, but also follow the doctor’s advice to continue the luteal support therapy, but also in the 4-5 weeks after the transfer of ultrasound examination to clarify the normal intrauterine pregnancy. When abdominal pain, vaginal bleeding and other abnormalities occur after the transfer, you need to go to the hospital in time.