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Embryo Coculture : Sequential Transfer and Blastocyst Freezing
Even though many efforts have been done for fifteen years since the birth of the world's first test tube baby, the rate of assisted reproductive delivery was still low. Nowadays, tubal replacement procedure becomes more popular than the uterine transfer. However, this technique still ends up with a very high incidence of abortion. Many workers claimed that coculture system resulted in more prominent blastulation rates (70 percent) as compared to the conventional method (25-30 percent). This is due to the possibility to select the good, healthy blastocysts which can cleave at a speed comparable to in vivo fining. This paper discusses the possibilities of sequential two-stage transfer, blastocyst transfer and blastocysts freezing that many eventually lead no improve the success of the delivery rates.
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