Hi Diamond,

I am not familiar with the grading system but I was told that if a blast has gone into hatching phase it is a top notch blast. Equally good but not as good is a blast which its cells clearly show a polarity/specialisation (just before the hatching phase). Lastly a very good blast would be one that are in the multi-cell stage where they are all jumbled up. My current bub is in this last group of blast.

I think you have a very very good embie in there. GL.

Kahlan