What's New at the World Egg Bank

Guide to the Interpretation of Egg Banking Success Rates And the Experience of The World Egg Bank

Everyone seeking infertility treatment wishes to know their chance of success. The likelihood of a positive outcome from infertility treatments can be assessed in different ways. However, often data is reported in a manner that affects interpretation of the results. As such, the success of treatment can be presented which make the likelihood of success seem higher than it really is. This brief guide will help you to understand the variety of 'success' rates you may see and the considerations that may or may not be present in the data results, so that you can make a fair comparison of the information.


The initial measure of success with a frozen egg cycle would be the number of eggs that survive the cryopreservation process. It is at this stage that the interpretation can begin to become confusing because the term "survival" is in itself, rather poorly defined. How can this be? Survival is usually defined by some functional parameter. Very often this parameter is whether the cell's outer membrane remained intact after the cells were warmed. Loss of the integrity of the cell's outer membrane is one of the most common means by which cells will perish when they are subjected to a cryopreservation procedure. Historically, this is one of the most common means by which survival has been defined in cryobiology. If the cell's outer membrane is not intact, the rest of the cell's function is lost. Hence, a cell has no chance of functioning normally if the outer membrane is not functioning normally. The loss of the integrity of the cell's outer membrane is immediately apparent, and as such is a good indicator of whether the damage was or was not due to the cryopreservation procedure.

Survival can also be defined by...

What Next?

We are getting ready for the European Society of

Human Reproduction and Embryology (ESHRE) in London, United Kingdom

The World Egg Bank scientists and doctors will be attending the ESHRE conference in July, 2013. We keep up on the latest national and international technology as well as looking to the future by working with leaders in cryopreservation world-wide.