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How do Egg Freezing and Embryo Freezing compare?
How do the two processes of egg freezing and embryo freezing compare in terms of embryo safety, likelihood of birth defects, length of viability, etc?
The information provided by medical professionals in the Q&A is for informational purposes only, and is not a substitute for individualized medical advice,
diagnosis or treatment by a qualified health care provider.
Answers
Replied on 3/22/2010
By: Laurel Fertility Care | San Francisco, Marin, East Bay and the Central Valley.
San Francisco, CA
In Egg Freezing, the eggs are removed and frozen. They are not fertilized (no embryo created). The difficulty is that they may not thaw as well and after thawing, they may not fertilize as well. The current technology suggests that it takes ~ 7-10 eggs from a woman < 35 to result in a pregnancy for pregnancy rate of 10 - 14%. When embryos are frozen, we know a lot more information. Only good quality embryos are frozen and the chance for pregnancy is ~ 15 - 20% per embryo when transferred. Therefore, the current technology is better in freezing embryos. On the other hand, young patients not in relationships may freeze eggs as a backup for use when they meet a partner later on in life.
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