Cryopreservation is often carried out as oocyte cryopreservation ahead of fertilisation, or as embryo cryopreservation right after fertilisation. After a physician deems the uterine lining favorable for embryo transfer, the frozen embryos thaw. Then, a physician transfers them to the uterus using a catheter. The process is usually pain-free and https://www.ivf.com.mx/