Oocytes retrieved during fertility preservation treatments and embryos resulting from in vitro fertilization cycles may be cryopreserved (frozen) and stored at CRM's Embryology Laboratory for future treatment cycles.

CRM's vitrification (ultra-rapid freezing) technique replaced traditional slow-freezing and is now used to cryopreserve all oocytes and embryos. Survival of embryos and oocytes by vitrification exceeds 90%. Currently, pregnancy rates are comparable for transfer of fresh or frozen embryos at our Center.


Above, L-R: Two oocytes contracting as they are vitrified (rapidly frozen). 

Cryopreservation Bottom

Above, L-R: Expansion of an oocyte as it thaws. 

Weill Cornell Medicine
Ronald O. Perelman and Claudia Cohen Center for Reproductive Medicine

1305 York Avenue, 6th Floor
New York, NY 10021 Phone: (646) 962-2764