as a result of CGH testing after 12 YEARS of IF! CGH testing tests the cells that come from what will be the placenta, not the embryo (or what will be the fetus) itself. the small risk of damage to the embryo is much lower than the risk of failure of a cycle due to the transfer of embryos that could very well be abnormal. even young donors can have up to 65% abnormal eggs, it's a proven fact. AND amongest young women, how fertile any one woman is varies widely. so if any IF Dr. is perplexed, they can't possibly be up on their homework, IMO. do the testing, transfer ONLY normal embryos, and save yourself some headache, heartache and dollars. goodness sakes I wish this testing would have been available to us a decade ago! rough numbers on our cycle, out of 8 tested, 5 came back normal. my two now are part of those 5, and we are going back for another baby soon.