Genetic information plays an increasingly important role in ourlives. As a result of the Human Genome Project, knowledge ofthe genetic basis of various diseases is growing, withimportant consequences for the role of genetics in clinicalpractice, health care systems and for society at large. In theclinical setting genetic testing may result in a better insightinto susceptibility for inheritable diseases, not only before orafter birth, but also at later stages in life. Besides prenataltesting and pre-conceptional testing, predictive testing hasresulted in new possibilities for the early detection, treatmentand prevention of inheritable diseases.