Preimplantation genetic testing (PGT-A)This is a modern method of examining embryos for chromosomal rearrangements before they are transferred to the uterine cavity during IVF. During the procedure, embryologists take several cells from the embryo shell (trophectoderm) at the blastocyst stage and perform their genetic analysis, which allows them to identify chromosomal abnormalities (PGT-a), monogenic diseases (PGT-M) and translocations (VILLAGE-SP). The main advantage of HRT is that it makes it possible to select an embryo without chromosomal rearrangements even before pregnancy, which increases the chances of having a healthy child in the older age group and reduces the risk of termination of pregnancy. In low-quality embryos, noninvasive PHT can be performed. Trophectoderm cells may not be enough in such embryos for biopsy and may be of interest for further implantation. Embryologists can examine the environment in which the embryo developed, rather than the cells of the embryo itself.