On Day 5 of embryo growth, a laser makes a small hole in the shell of the embryo and a few cells are removed with a tiny pipette. These cells are from the trophectoderm, which are the cells that eventually become the placenta. The biopsied cells are put in a tube and sent to an outside genetics laboratory. There, scientists amplify the DNA and use a technique called Next Generation Sequencing (NGS) to assess the embryo’s chromosomes. Because it takes 1 – 2 weeks to get results, embryos are frozen immediately after biopsy. If an embryo is diagnosed as euploid (a normal amount of DNA, 46XX or XY), you may proceed with an FET.
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