Blood value refers to blood HCG. Generally, doubling of blood HCG on day 12-14 of blastocyst transfer is normal, indicating that the embryo is well developed. Blastocyst transfer refers to the transfer of embryos formed by in vitro fertilization into the uterine cavity, which belongs to a kind of assisted reproductive technology to help women get pregnant. Usually, 12-14 days after blastocyst transfer, the blastocyst may have already been implanted in the uterine cavity, so the doubling of blood HCG is normal, indicating that the embryo is in good developmental status, and if the development is not good, the doubling of blood HCG will not occur. Secondly, ultrasonography is needed about 4 weeks after blastocyst transfer, mainly to clarify the location of the embryo and its specific development. During this period, you need to keep your mood happy, pay attention to rest, adjust the diet structure, eat more high-protein, high-calorie, high-vitamin food. All in all, people who have undergone blastocyst transfer should follow the doctor’s instructions to go to the hospital for follow-up on time and strengthen the management of daily life.