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Goodmorning, I was wondering the survival rate of a grade 2 - 2.5 embryo. We were recently supposed to undergo FET with a grate 2 and grade 2.5 embryo which were stored for over a year, however 1 hr before transfer were notified the embryos didn't survive the thaw. What is the survival thaw rate? Also, whats the possiblity of a clinical error since last year we successfully had our first baby thru a fresh ivf/icsi with a grade 2 emb? Thanks.
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