while 2 is a shock after getting so many numbers, they will only freeze those that are in the top grades.
Here is the info I go - going by this the only way you're going to get better embies is if they were already hatched, yours are about to
Our IVF clinic and many others that do blastocyst culture and transfer use a blastocyst scoring system originally developed and published by Dr. David Gardner in the late 1990's.
There are other grading systems for blastocysts , but this one is most widely used.
Blastocyst Development and Blastocyst Quality Grading (or scoring)
There are 3 distinct parts to a blastocyst - the two cell types and the fluid cavity (see picture above).
As development of blastocysts progresses, cells in the 2 components divide and the fluid cavity enlarges.
With continued blastocyst development the embryo expands, the shell thins, and it hatches from its shell. Blastocyst Implantation into the lining of the uterus can then begin.
This blastocyst grading system assigns 3 separate quality scores to each blastocyst embryo:
1. Blastocyst development stage - expansion and hatching status
2. Inner cell mass (ICM) score, or quality
3. Trophectoderm (TE) score, or quality
Blastocyst development and stage status
1. Blastocoel cavity less than half the volume of the embryo
2. Blastocoel cavity more than half the volume of the embryo
3. Full blastocyst, cavity completely filling the embryo
4. Expanded blastocyst, cavity larger than the embryo, with thinning of the shell
5. Hatching out of the shell
6. Hatched out of the shell
Inner cell mass quality
A - Many cells, tightly packed
B - Several cells, loosely grouped
C - Very few cells
TE grade Trophectoderm quality
A - Many cells, forming a cohesive layer
B - Few cells, forming a loose epithelium
C - Very few large cells