Genetic tests that predict risk of illness are becoming much more common, and there are even growing numbers of multiplex tests available commercially--tests that can check for a range of gene changes all at once. But might these raise worries that then lead to increased demand for healthcare services? No, according to a National Institutes of Health-sponsored study. The study looked at people between 25 and 40 who took up the offer from their healthcare provider of a multiplex test for 8 common health conditions. There was no real increase in the numbers of visits to doctors or demands for lab tests in this group before and after testing--so doctors don't have to be concerned about the impact on the healthcare budget. However, this study does raise the query--if the tests don't change people's behavior, are they worth it? Press release | Abstract