Which one is better, the third day embryo or blastocyst, depends on the woman’s own situation, in which the third day embryo is more suitable for women who have weak ovarian function and get fewer embryos, while the blastocyst is more suitable for women who are older, who have repeated ectopic pregnancies, who have repeated failed implantations, or who need to undergo third-generation IVF.
Day 3 embryos and blastocysts refer to different stages of embryo development. Generally speaking, the fertilized egg will divide into 6-8 cells when it grows to day 3, which is also known as the cleavage stage embryo, and then the blastocyst will gradually form on day 5-6. During IVF, 2-3 cleavage stage embryos are usually selected for transfer, some of which will gradually develop into blastocysts.
Structurally, blastocysts are more mature than cleavage stage embryos and are more suitable for growth in the uterine environment, resulting in a higher success rate. However, since different women have different health conditions, there is no clear-cut statement on which is better, the third day embryo or the blastocyst, and the situation varies from person to person.
Usually, for women who have weak ovarian function and get fewer embryos, it is better to transfer third day embryos, while for women who are older, have repeated ectopic pregnancies, have repeated transfer failures, or need to undergo third generation IVF, transferring blastocysts is better.
Therefore, women are advised to go to the hospital for a detailed examination in time, actively communicate with the doctor, and let the doctor choose the suitable way to get pregnant, and never decide on their own, so as not to affect their health.