Since we have never had a surrogate change her mind and fight to keep the baby, SSA has a 100% success rate. We cannot quote pregnancy success rates because we do not provide medical treatment. The relevant success rates for you will depend on many medical factors. For example, the age of the eggs and the particular infertility issue are always important. An arrangement using donor eggs generally has a higher chance of success because the average donor is relatively young and has no history of infertility. However, statistics will vary from case to case and doctor to doctor. This is a question best discussed with your IVF physician.