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Gender selection is a medical procedure that allows parents to choose the gender (sex) of their baby. There are two gender selection methods in IVF Cyprus â€“ PGS and Sperm Swim-Up. PGS (Preimplantation Genetic Screening) is performed on day 3 or day 5 of embryo development to detect chromosomal abnormalities in embryos and transfer only the best one(s) into your uterus. With sperm swim-up, gender selection is done by sorting out the sperm sample into female and male batches to attempt fertilizing the eggs with the X- or Y-bearing sperm.