الفهرس 
Assesment of the zygote and cleaved stages Frozen-thawed human embryos by vitrification and their survival to blastocysts
CONTENTSOnly 14 pages are availabe for public view
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Abstract
Cryopreservation of human gametes and embryos is now considered as an important tool in assisted reproduction treatments as it increases the cumulative pregnancy rates while decreasing cost.Two common methods of cryopreservation have been used. Recently, the one known as vitrification has been claimed as the future of cryopreservation because of increased survival and success rates. Our study was carried out to a) assess whether vitrification at different early stages (zygotes and cleaved stages) of human embryos alters the outcomes of vitrification. b) if so, to predict the preferable stage between the two stages of vitrification of human embryos to attain the highest yields. The most preferable stage of vitrification will be identified on the basis of blastocyst formation obtaining from extended culture conditions of the thawed embryos till day 5, using non-transferable embryos.Our results indicate that early- cleaved embryo stages gave the most successful outcome on the fifth day of culture