Classification of IVF embryos

The grade of test-tube embryos is classified according to the condition of the embryo. The classification criteria are comprehensively considered based on three aspects: cell number, size, degree of fragmentation and whether they contain particles. Of course, embryos

The grade affects the success rate of test tubes to a certain extent, but embryo quality andembryo gradeare also related. Simply put, the higher the level, the higher the success rate.

Criteria for classifying test tube embryo grades

n

Embryo grade is divided into four levels, which are graded according to the number, size, degree of fragmentation and whether the embryo cells contain particles. The details are as follows:

1. First-level embryo: The cell size is equal, with 0 to 5% fragments, and no granules in the cytoplasm.

2. Secondary embryo: The cell size is slightly uneven, with 6% to 20% fragments, and granules in the cytoplasm.

3. Level 3 embryos: The cell size is obviously uneven, with 21% to 50% fragments, and obvious granules in the cytoplasm.

4. Fourth-level embryos: The cell size is severely uneven, with fragments greater than 50%, and the cytoplasm also has obvious granular phenomena.

Relationship between embryo grade and test tube success rate

1, Level A

Grade A embryos are usually uniform in size, regular in appearance, and have no obvious fragments, which may reach about 40%-50%.

Level 2, B

Grade B embryos are good embryos. The fertilized egg divides evenly with a few fragments, and there are certain irregularities in the size and shape of the embryo cell mass

3. Level C

Level 4, D

Grade D embryos are unusable embryos and are generally of poor quality and cannot be used for transplantation.