Genetic Screening is performed by testing a blood sample to see if a person is a carrier for a specific genetic disorder. For a couple planning a pregnancy, the mother is tested first and if she is found to be a carrier of a specific mutation, then the father is tested to see if he is also a carrier of the same mutation. The blood sample is drawn in our office and then sent to GSG. If you and your partner are carriers for the same disease, your child has a 1 in 4 (25%) chance of having that disease. If you are found to have a high reproductive risk, you have options.