Freezing Of Embryos & Semen
Most people call it embryo freezing, but more correctly it is “embryo cryopreservation” because the ultimate goal is to store the embryo cryogenically and to preserve its viability for future initiation of pregnancy.
Before good embryo cryopreservation protocols were available, most IVF clinics had to discard any excess embryos left over after embryo transfer. Early embryo cryopreservation programs usually had limited success. Today, more successful protocols have been introduced that have made embryo cryopreservation much more successful. Many IVF children now have younger siblings that were conceived at exactly the same time, but born years apart due to the increased success of embryo cryopreservation.