What is a day three embryo?
This is an embryo, which has grown either in the fallopian tube or in the laboratory for a period of three days. From fertilization when the sperm enters the egg until the third day of development the embryo divides in a predictable manner until it becomes a 6 to 10 cell embryo. Most In Vitro Fertilization ( IVF) programs transfer these embryos into the uterus at the 8-cell stage. Embryos can be graded in terms of quality based on their appearance. Some factors influencing the grading are the number of cells present, size of the individual cells, and the presence or absence of cellular fragments.
