Editorial: It Is Time to Pay More Attention to Sperm Cryopreservation: Now More Than Ever!

Semen cryopreservation and sperm freezing has a long history of over 65 years. however, embryo freezing and oocyte cryopreservation in human infertility has a shorter history up to 40 years. embryo and oocyte freezing had a tremendous progress and development in past four decades so it improved from slow freezing procedure with less than 10% survival rate at beginning to vitrification procedures with 100% survival rate through freezing/thawing cycle for oocyte and embryo at present. relying on this improvement of the freezing techniques, fertility preservation for women due to medical or social reasons has been carried out as a secure and efficient service worldwide. also, embryo freezing is a fixed part of ivf/icsi infertility treatment cycle to increase the success rate of these cycles. the practice is done in a way that, at present, freezing of all embryos and subsequently transfer of frozen/thawed embryos in natural cycle without ovarian stimulation is possible. this current capacity is provided by the guarantee that no embryos are damaged through the freezing/thawing procedures.