Tuesday, 22 October 2019

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blastocyst grading

gradeblastocyst development stage status
B1Blastocoel cavity less than half the volume of the embryo
B2Blastocoel cavity more than half the volume of the embryo
B3Full blastocyst, cavity completely filling the embryo
B4Expanded blastocyst, cavity larger than the embryo, with thinning of the shell
B5Hatching out of the shell
B6Hatched out the shell


grade Inner cell mass (ICM )quality
1Many cells, tightly packed
2Several cells, loosely grouped
3Very few cells


gradeTrophectoderm quality
1Many cells, forming a cohesive layer
2Few cells, forming a loose epithelium
3Very few large cells
 
embryo grading

gradedescription
1blastomeres of equal size, no fragmentation
2blastomeres of unequal size, <10% cytoplasmic fragments or granular blastomeres
3blastomeres of unequal size, 10-50% cytoplasmic fragments and granular blastomeres
4blastomeres of unequal size, >50% cytoplasmic fragments and granular blastomeres