Inclusion Criteria1. Patients 21-85 years old, male or female.
2. Suspected TBI, acute ischemic stroke, or nontraumatic/nonlesional ICH based on clinical and radiographic evidence as determined and documented by the appropriate service (Trauma Service or Neurosurgery Service for TBI; Neurology or Neurosurgery Service for Stroke) at University of Kentucky.
3. Patients with impaired capacity may be included; as the pathology to be studied (stroke or TBI) may impair their capacity (please see attached required documentation regarding impaired capacity).
Exclusion Criteria1. Pregnant women as the effect of pregnancy on the biomarker testing result is as yet unknown.
2. While patients may be included with the above listed diagnoses, they may be excluded later if an alternate unlisted diagnosis is found to be the root cause of their presentation. An example would be a patient initially thought to have a stroke, who is discovered to be suffering from a seizure instead.