Embryo Biopsy: Pgd/pgs is done by creating embryos and allowing them to grow to the 3rd or 5th day of life. The 5th day provides more accurate results. A small laser hole is made in the placental tissue of the embryo and the cells are sent out to a lab that can evaluate each embryo for all 23 sets of chromosomes including the sex chromosomes. Some labs obtain blood samples from the parents to validate results.
Answered 4/1/2013
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