|
The general opinion is that embryos that reach the blastocyst stage on Day 5 have a slightly better developmental potential compared to embryos that reach the blastocyst stage on Day 6. However, the difference is very small if, in both cases, the embryos are fully expanded blastocysts with an adequate number of stem cells. Embryos that grow slowly at the cell stage (2-8 cells) can be normal or abnormal (so its not al that predictive). However, embryos that stop growing at the cell stage are always genetically abnormal (assuming that lab conditions are optimized).
The percentage of genetically normal emryos for women over 40 is somewhat variable, but ranges from approximately 20% at 40 to very near zero at 45+.
Reply
|