Blastocyst vitrification is standard in assisted reproduction, but clinical data on ultra-rapid vitrification are limited. This pilot study evaluates the safety, feasibility, and preliminary clinical performance of an ultra-rapid blastocyst vitrification protocol compared with the standard approach.
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Post-warming survival rate
Timeframe: Immediately after warming (within the same laboratory session)
Clinical pregnancy rate per transfer (only first transfer will be considered).
Timeframe: 6-8 weeks after embryo transfer