One of the most controversial questions for patients looking for egg donation is whether or not the eggs are fresh, and if this makes a difference.

With the use of cell vitrification during recent years, survival after thawing has improved greatly for sperm and embryos. However, the size of an egg (the largest cell in the human body) makes it more susceptible to thermal stress. Therefore the rate of survival is not as high, and it is possible that certain cellular structures suffer in the freeze-thaw process. […]