Researchers at Duke University have used 3D inkjet printing to create a diagnostic tool that has the potential to be better than ELISA, the diagnostic test for a variety of diseases like HIV AIDS. The 3D printed biomedical tool, called D4 Assay, can be used in point-of-care settings to screen patients, has high accuracy and can reduce the time of diagnosing from days to 15 minutes. It is a self-contained test in the vein of a lab-on-a-chip that can detect low levels of antigens from a single drop of blood. The scientists used inkjet technology to print an array of antibodies onto a glass slide with a nonstick polymer coating.