In That During the Process of Doing in Vitro Fertilization

In that during the process of doing in vitro fertilization, human embryos are rated for quality, discarded if they contain defects, and frozen for later use or disposal, none of which we would allow during the other stages of human existence, does this mean that in vitro fertilization is ethically wrong? Provide an ethical defense that you feel overcomes the argument against in vitro fertilization based on the sanctity of human life.