O-172 Room and directions for improvement in oocyte cryopreservation

Abstract Cryopreservation and more specifically oocyte vitrification has become a before after in the field of Assisted Reproduction Techniques. Despite great efforts to improve slow freezing protocols, levels reproducibility, survival rates clinical outcomes achieved by have never been reached any these old approaches. However, once this barrier was overcome, new challenges emerged. We must reassert ourselves on issues such as efficacy, efficiency safety technique that is now fully implemented IVF laboratories around world. Continuos monitoring improvement part quality management system mandatory, keep standards qualilty, identify factors may affect look for room improvemnt finetune protocols. But also it important provide answers women who wish preserve their fertility medical or non-medical reasons. They key questions how many oocytes store, what rate will be warming, cryopreserved able fertilize develop good fresh counterparts, does number used cumulative live birth rate? Also undergoing ART, represent successful strategy. For example, patients with low response at risk ovarian hyperstimulation, two sides coin, benefit from cryopreservation. The former, storing accumulating allow them obtain success comparable those normal responders while avoiding adverse effects response; latter, postponing insemination over time, investing safety. Yet embryo can offer alternatives so both options explored compared Trial registration XXXX