A critical appraisal of cryopreservation (slow cooling versus vitrification) of human oocytes and embryos

Human Reproduction Update, 05/04/2012

Available evidence suggests that vitrification is the current method of choice when cryopreserving MII oocytes. Early cleavage stage embryos can be cryopreserved with equal success using slow cooling and vitrification. Successful blastocyst cryopreservation may be more consistently achieved with vitrification but optimal slow cooling can produce similar results.

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