Innovations in sample collection matrices that overcome the limitations of DBSscould help address the large need for accurate viral load measures (25). This studyexamined the performance of a novel plasma collection device, the cobas plasmaseparation card (PSC), which shares many features of the DBS but which collects plasmarather than whole blood. Using paired EDTA plasma and PSC samples, we examined thecard’s bias and misclassification at a viral load threshold of 1,000 copies/ml, as well asits usability, limits of detection (LoD), and stability. A successful PSC approach wouldretain the sample collection and transport advantages of the DBS but have improvedsensitivity, specificity, and reliability.