Successful gender selection requires both sperm microsorting and preimplantation genetic testing. With microsorting you are enriching the spermatozoa prior to conception so that most sperm in the sample is the gender you desire. As far as effectiveness, microsorting can produce on average, a purity of 78% male sperm, and 90% female.The preimplantation genetic embryo testing confirms that the embryo is the right gender before placing it back into the uterus. With this testing and assuming that you have an embryo that is the right sex available for implantation, the success rate of gender selection is very high, 99%.