What couples should know about how genetics can affect their baby It is not just Tay-Sachs... there are now carrier tests for many more diseases. Carrier screening is recommended for everyone planning to have a child. Prior to testing consult with a genetic counselor to review the best options for screening. The best time to be screened is before pregnancy – carrier couples have multiple reproductive options to build a healthy family. Explore your options for up-to-date testing before any pregnancy – screening panels improve over time and diseases are often added. If you have had any genetic testing, it is important to review your results with a genetic counselor.