The success rate of raising blastocysts varies from person to person and there is no specific value available. In the process of performing IVF-assisted reproduction, sperm and eggs are mated in vitro to form embryos. Because of the high success rate of blastocyst transfer, after the embryos are scored on day 3 of the embryo matching process, some or all of the embryos are selected for bladder raising according to the patient’s wishes and needs. The success rate of sac retention is mainly affected by the quality and grade of the embryos themselves. The better the quality and grade of the embryos, the greater the success rate of sac retention. However, the success rate of embryo transfer does not depend entirely on whether it is a blastocyst transfer or a cleavage stage embryo transfer, but is also affected by maternal factors. Therefore, the actual process of whether or not to raise sacs should refer to the professional opinion of the doctors in the assisted reproduction center.