СД на 100% не исключаетhttps://www.fertstert.org/article/S0015-0282(01)02871-0/pdfA 40-year-old individual has a 2.5% risk of developing a pregnancy that is a carrier of Down syndrome, both naturally and through IVF. If you carry out pre-implantation genetic testing, you remove 98% of that 2.5% risk. It becomes a minimal risk for an individual or couple.https://pmc.ncbi.nlm.nih.gov/articles/PMC1120748/