I was looking for information on how often a clinic is able to freeze blastocysts. As per a doctor at our last clinic, in about 50% of the total cycles they perform, there are no blastocysts which can be frozen. This is because either none of the embryos develop to blastocyst stage, or those that do become blastocysts are of poor quality and hence not good enough to freeze.
Out of our 3 cycles with them, they only managed to freeze 2 blastocysts from our first cycle. In our last meeting with them, they indicated that our embryos had developed to blastocysts on our other cycles also, but they were not frozen because they were judged to be of poor quality.
I was wondering whether 50% of cycles with nothing to freeze is the average rate for all clinics and what standards are used to judge whether a blastocyst is worth freezing or not.
Thank you for any replies!