An embryo is when the baby is at its earliest stage in development. The embryo needs to be screened to check if everything is go good. What geneticists do is that the screen embryos for genetic affects and then they choose those that are free of diseases and put them to implant into their uterus.
Prenatal Screening / Prenatal Microarray
Prenatal testing is to identify and to confirm among those at high risk. Then there's the prenatal microarray, which identifies small deletions or duplications. After being informed if its at high risk or not you have the choice to continue or terminating an affected fetus.