Stephen Williams, University of Virginia (IMAGE) University of Virginia Health System Caption Stephen Williams, Ph.D., of the University of Virginia School of Medicine, envisions doctors using a blood test and genetic results to predict patients' risk of recurrent ischemic stroke. Credit Josh Barney | UVA Health System Usage Restrictions May be used by reporters and webmasters to accompany news coverage of the blood test. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.