SUBJECT: MRI versus CT scan for TBI/consciousness/S100B. MESSAGE: For adult patients:  Following a TBI what is considered most  conclusive for damage: MRI, MRI with contrast, CT, CT with contrast. Also, do you think whether a person losses consiousness is given too much credence for evaluating a TBI? How long is a S100B able to detect damage following a TBI? Do you yhink this is a valid test for E.D. immediately following injury?  If so, why is it not done, ignorance or expense? Could a patient demand it be drawn?  Thank you

Summarized question: What are the most reliable tests for diagnosing TBI?