Prior to embryo implantation, some patients may elect to select the gender of their child.
Embryo testing is offered for screening of embryos for chromosomal or specific genetic disorders. The term preimplantation genetic diagnosis (PGD) has been renamed preimplantation genetic screening (PGS) because test results are not 100% accurate or reliable. PGS has become the generic name and includes a number of different tests including PGS-FISH, PGS-PCR, SNP, metaphase-CGH and array-CGH. Each of these options has advantages and disadvantages and the type of PGS test planned should be determined following a detailed discussion with the fertility specialist.
To test all 46 chromosomes, a fertility specialist may employ a newer technology called comparative genomic hybridization (CGH).