Abstract
Cryobiology is an essential part of In Vitro Fertilisation programs. Indeed, cryopreservation of human zygote or embryos from the early cleaved-cell stage up to the blastocyst stage is a safe procedure, which has been carried out for the last 25 years. Experience with blastocyst cryopreservation is still limited and pregnancy rates after the use of frozen, thawed blastocysts vary extremely. Recently, vitrification has showed to potentially improve the success of embryo cryopreservation, compared to the slow freezing procedure. However, this technique cannot yet be considered as a routine procedure. This review aims to answer the optimal stage of freezing human embryos.
Keywords: Cryopreservation, zygote, early cleaved stage, blastocyst, vitrification, slow freezing
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RARE CASES IN GYNECOLOGY-OBSTETRICS
With the development of diagnostic and therapeutic techniques (such as ART techniques) and the immersion of new pathologies (such as COVID19), we are witnessing an increase in the incidence of pathologies that were previously described as rare or exceptional. the practitioner sometimes confronts difficult situations in these cases in diagnostic ...read more
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