ABSTRACT
Preselection of oocytes and embryos with the highest developmental potential, currently based on morphological criteria, is of obvious practical importance for improving the efficiency and standards of assisted reproductive technologies (ART). To date, the available evidence shows that despite morphological parameters being of certain value for suspecting aneuploidy, they are not sufficient for excluding embryos from transfer, although it is known that a significant proportion of chromosomally abnormal embryos fail to reach the blastocyst stage. Thus the aneuploidy testing of oocytes and embryos is required for preselection of oocytes and embryos with a higher chance of resulting in viable pregnancy, which unfortunately is limited to only a small proportion of IVF centers.
