[Preimplantation genetic diagnosis of chromosome abnormality by fluorescence in-situ hybridization].

Objective: To perform preimplantation genetic diagnosis (PGD) of chromosome abnormality using fluorescence in-situ hybridization (FISH).

Methods: Ten couples were presented for preimplantation genetic diagnosis. They had a total of 10 oocyte pick-up cycles. The collected oocytes were inseminated by intracytoplasmic sperm injection. PGD was carried out using cleavage-stage (day 3) embryo biopsy, fluorescence in-situ hybridization, and day 4 embryo transfer.

Results: Ten oocyte pick-up cycles yielded 158 oocytes. Among the 94 embryos obtained, 54 embryos were biopsied and FISH analyses were performed for 51 blastomeres. Twenty-four embryos were transferred on the fourth day. There were 4 clinical pregnancies: 3 infants have been born, and 1 couple had ectopic pregnancy.

Conclusion: PGD is a valuable method to prevent the high risk of spontaneous miscarriages and conceiving chromosomally unbalanced offspring.