The contribution of embryo cryopreservation to the birth rate per in vitro fertilization
cycle has escalated from a rare subsidy to a vital tool that is called upon to augment
the cycle outcome. Embryology laboratories must identify the embryo stage, quality
criteria and methodology that will optimize their ability to preserve each embryo's
reproductive potential. This chapter reviews the principles of cryopreservation, outcomes
based on embryo stage and cryopreservation method and benchmarks that may be employed
by the laboratory to measure the performance of their embryo cryopreservation program.
Keywords
cryopreservation - embryo - blastocyst - pronuclear stage - vitrification - slow freezing