Dear Dr. Sher,

do you have experience with the freeze of day 4 embryos (morulas)?
My clinic is suggesting that we freeze all remaining embryos on day 4 after transfer on same day, because day 5 is a Sunday and they are not working. Because I missed the zygote state for freeze, the remaining options are day 3 or day 4 (maybe day 6 if there are slower ones, but not the normal growing on day 4). Currently 4 embryos are cultivated, but in my previous cycles I had 100 % of the embryos reaching morula state and if cultivated further they all reached blastocyst state at day 5.

Would appreciate your Expertise on this, since studies in this area are not conclusive and many clinicians do not freeze morulas at all. But I am lacking a real reason for that. Thanks in advance!

Best