In ICSI (as I'm sure you know) the embryologist selects a healthy looking sperm and injects it manually into the egg, usually with a procedure called "assisted hatching" where she makes a small hole in the egg's outer shell.
It costs more but can help when there are sperm issues.
Though there were no sperm issues (as far as our RE told us) we did some ICSI, some non-icsi and had them freeze extras in separate straws since ICSI has been associated with some rare birth defects. Our fresh eset blast transfer (ICSI baby) led to our DD. Our embryologist also used assisted hatching for our daughter's creation.
mom to Sarah via DE IVF
HELLP syndrome survivor