![]() ![]() So the least advanced blastocyst would be 1CC, and the most would be 6AA. Trophectoderm (TE) score, or quality – range A – C (A being the best) Inner cell mass (ICM) score, or quality – range A – C (A being the best)ģ. Blastocyst development stage – a range from 1 – 6 (with 5 being the most developed)Ģ. According to the Gardner system, each blastocyst embryo is assigned 3 separate quality scores:ġ. The most common system for ranking the quality of blastocyst embryos is the Gardner grading system. The Gardner Embryo/Blastocyst Grading System Many IVF doctors will do embryo transfer only once the embryo reaches Blastocyst stage, although some others prefer to transfer sooner and let the embryo reach Blastocyst stage within the uterus. Both should be well formed for the pregnancy to be successful.īlastocyst transfer can have high pregnancy success rates with very low risk of multiple births. The Inner Cell Mass (ICM) will become the fetus, the Trophectoderm (TE) will become the placenta. As development of a Blastocyst progresses, these two cellular masses divide and the fluid cavity enlarges. ![]() The quality of the blastocyst describes how clearly formed are these structures. Knowing the components of a blastocyst is key to understanding its grade and likelihood of a successful pregnancy.Ī blastocyst is distinguished by its two clearly defined cell components and a fluid cavity. Once hatched, the embryos is not viable for transfer. By day 7 the blastocyst should start hatching. The blastocysts should develop by Day 5 or 6. By Day 4 the cells should begin to clump together to form the Morula. The normal timeline for embryo development is after two days of cultivation the embryo should have between 2-4 cells, then 6-8 cells by 3 days. If the embryo successfully attaches to the uterus, then you have a pregnancy. If the blastocyst develops beyond this stage in the lab, it’s no longer viable.
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