Defrosting
1 Replies
JaneX - November 19

Does the survival rate of embryos that have been through the freezing process indicate anything. If only 50% of embryos survive freezing does this make any difference to the chance of pregnancy than if 100% survived freezing, aside from the fact that you might have more to chose from when it comes to putting them back.

Thanks,
Jane

 

Dr Smith - November 20

The percentage of embryos that survive the thaw is dependent on the initial quality of the embryos that were frozen. If the lab is indiscriminant in the quality of the embryos they freeze (and many unsuitable embryos are frozen), then it is common for a significant porportion of the embryos not to survive the thawing process. Alternatively, labs that are highly discriminant have a much better post that survival rate. In either case, the porportion of embryos that do not survive the thaw does not significantly affect the developmental potential of the embryos that do survive the thaw. In a sense, low quality embryos have been "weeded out" by the freeze-thaw process.

 

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