Abstract: Systems and methods for determining diagnostic and/or prognostic risk of having or developing brain injury related symptoms after a head impact includes a point-of-care assay reader, a PHI smart device application, and a neurocognitive/vestibular smart device application. The diagnosis and prognosis server application includes instructions stored on a non-transitory computer-readable medium executed on the server that receives patient protected health information (PHI) from the PHI smart device application, receives neurocognitive test results from a neurocognitive testing application, and receives assay results from the point-of-care assay reader and generates a diagnostic score and a prognostic risk scores for post-acute traumatic brain injury TBI symptom categories as measures of patient outcomes.