Preimplantation genetic diagnosis (PGD) by FISH can be carried out to select embryos free of common chromosome abnormalities, for transfer during an IVF cycle. PGD offers a new alternative to chorionic villus sampling or amniocentesis. In IVF cases, following embryo biopsy, a single blastomere is fixed on the slide and is subjected to the FISH procedure for study of aneuploidies.…