The use of laser assisted hatching of frozen/thawed embryos versus laser assisted hatching of fresh embryos in human intracytoplasmic sperm injection.

Unlabelled: Cryopreservation of human embryos has become an essential part of assisted reproduction. It limits the number of embryo transferred while supernumerary embryos can be transferred in subsequent cycles, however, it is associated with zonal hardening, which lowers the success rate in the majority of (ICSI) centres, associated with decreased implantation rate and clinical pregnancy rates. Assisted hatching has been used to induce microdissection of the zona pellucida.