The results of infertility treatment by extracorporeal fertilization remain constantly low. Most resorts IVF -ET carries two ? three selected embryos in the second day of culture at the stage of four blastomeres . Evaluation of the quality of such embryos is made on the basis of morphological characteristics and the rate of cell division . However, embryos with normal appearance of morphological and divisions , selected according to these criteria may be incorrect cytogenetically and will not be implantowały in the uterine cavity .
