TBI Diagnostics Explained: What Each Test Measures
Concussion is diagnosed by a clinician, not by a single test. Here is how standardized measures fit together and what they can and cannot show.
Who this is for: Written for patients, families, providers and legal professionals who want a clear overview of how concussion and TBI testing works.
Key takeaways
- No single test diagnoses concussion. A clinician interprets findings in context.
- Standardized measures can include eye-movement, neurocognitive and balance testing.
- Brain-activity (QEEG) measures are used only as an adjunct within a physician-interpreted evaluation.
- CT and MRI are designed to find structural injuries, which many concussions do not show.
- The physician-reviewed diagnostic report goes to the treating provider.
Why concussion needs more than imaging
CT and MRI are essential for finding bleeding, fractures and swelling. Concussion, however, is mainly a change in how the brain functions, and standard imaging is not designed to detect that. Many people with real symptoms have normal scans.
Standardized functional testing helps fill that gap by measuring how specific brain systems are performing compared with expected ranges.
Normal imaging and real symptoms can exist side by side.
The main types of standardized testing
Eye-movement testing looks at how the eyes track and focus, which depends on several brain systems. Neurocognitive testing uses short computer-based tasks to measure attention, memory and processing speed. Balance and symptom measures add structure to what the patient reports. Brain-activity assessment (QEEG) may be included only as an adjunct within a physician-interpreted evaluation.
Start here, then go deeper: Concussion After a Crash, The Provider Guide, How mobile testing works and all concussion education articles.
From test results to a report
A physician reviews the results together with the history and symptoms and prepares a physician-reviewed diagnostic report for the treating provider. Turnaround is typically 48 hours, or 7 to 10 days when labs are included. The treating provider decides on care.
Articles in this guide
- Eye-Movement Testing After a Head Injury: What It Measures
- Neurocognitive Testing Explained for Accident Patients
- EEG-Based Brain Activity Assessment: The Basics
- Mild TBI vs. Concussion: Are They the Same?
- Why a CT Scan Can Miss a Concussion
- Baseline vs. Post-Injury Concussion Testing
- Eye-Movement (Oculomotor) Testing
- Neurocognitive Testing
- EEG-Based Brain Activity Assessment
- Physician-Reviewed Diagnostic Reports
- Coordinated Specialty Evaluations
- Sample Report Walkthrough (Synthetic Example)
- Concussion & TBI Glossary
- Our Diagnostic Standards & Privacy
- Research Summaries (Plain-Language)
Emergency warning signs
Testing is never a substitute for emergency care. Slurred speech, new weakness, a seizure or trouble staying awake need the ER or 911 now.
Frequently asked questions
Is there one test that proves a concussion?
No. Diagnosis is a clinical judgment. Standardized measures give the clinician structured information to interpret alongside history and symptoms.
How long does a testing visit take?
A visit typically takes 30 to 60 minutes and is done at the referring provider's office.
What is QEEG used for?
At Braintree, brain-activity measures are used only as an adjunct within a physician-interpreted evaluation, never on their own.
We diagnose. You treat.
Mobile, physician-reviewed concussion and TBI diagnostics for Florida providers and their accident patients. Reports go to the treating provider, who decides care.
Book a 15-minute callRefer a patientOr call 813-709-3771
Sources
- MedlinePlus (NIH National Library of Medicine): Traumatic brain injury
- CDC: Symptoms of mild TBI and concussion, including danger signs
- TRACK-TBI (Transforming Research and Clinical Knowledge in TBI), UCSF
This guide is educational and is not medical or legal advice. If this is a medical emergency, call 911.