Is 4bc the worst blastocyst?

Experts on pregnancy preparation: The best is AA, the worst is CC, and 4 is the growth level classification, indicating embryo expansion. Although the success rate of IVF transplantation is average, if it is successful, most of them are healthy. For those curious about IVF grade 4, first of all, the development of blastocysts is divided into the following 6 stages of grading, and then ABC grading is carried out for blastocysts at different stages, and the stages are as follows:

D5 blastocyst growth and development

Stage 1: Early stage of blastocyst chamber stage, the blastocyst is less than 1/2 of the total embryo volume;

Stage 2: The embryo volume is greater than or equal to 1/2 of the total embryo volume;

The third stage: The blastocyst is completely expanded, and the blastocyst cavity completely occupies the total volume of the blastocyst;

Stage 4: The embryo expands, the blastocyst cavity is completely filled with the test tube embryo, the volume of the test tube embryo increases, and the zona pellucida becomes soft.

The fifth stage: the embryo is oviposited, and part of it escapes from the zona pellucida;

The sixth stage: The eggs hatch into embryos, and all the embryos escape from the zona pellucida.

The embryos were then graded according to the number of embryonic somatic cells (ICM) and the number of embryonic trophoblasts (TE). In this case, 4bc embryos refer to embryos that have been cultured for 4 days. BC is the class.

Is 4bc the worst embryo?

4BC is a division of embryonic levels. The first data is used to distinguish the growth rate, which can be divided into 1-6, and it can be understood that the bigger the better. The last two letters are the quality grade of the cells, which are divided into A, B, and C. It can be understood that A is the best and C is the worst. So 4BC is not the worst embryo.

Theoretically speaking, the higher the grade, the higher the success rate of test tube transplantation, and the transplantation is more cost-effective. However, it should be understood that test tube embryos with high histological scores do not necessarily have normal chromosomes, and there is no guarantee that miscarriage will not occur due to test tube embryo factors.

Blastocyst AD 4 is the quality standard of blastocyst, which means the 4th stage of training. The number of cells in the embryonic cell group is small and the arrangement is loose. The epithelial cells of the embryonic germ cells are composed of a sparse embryonic cell layer. Although all are not excellent embryos, they can achieve the quality standard of transplantation, and the general transplantation pass rate is very high.