BW, I'm not too sure about blastocysts. My nurse and FS keep telling me there is an 80% success rates of embies surving the thaw. Unfortunately I have had much lower numbers than that. I had only 1 out of 4 thaw. Makes me very nervous going into my next FET with only 3 in the freezer.
I am very skeptical about all the numbers they give me these days and how they come up with them.