Preimplantation Genetic Diagnosis (PGD), also called Preimplantation Genetic Screening (PGS), is a procedure used prior to implantation to help identify genetic defects within embryos created through in vitro fertilization to prevent certain diseases or disorders from being passed on to the child. In most cases, the female, male, or both partners have been genetically screened and identified to be carriers of potential problems. Here one of the 8 cells (Blastomere) is aspirated using a specific pipette, used for PGD, with the help of a micromanipulator (same equipment used for ICSI). Then the single cell is subjected to genetic testing utilizing their DNA chain to gain further information. If the cell seems to be normal then the embryo is declared as fit to transfer into the uterus.