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Concussion Baseline and ImPACT Testing: What It Can and Can’t Tell You

By Dr. Neil J. Patel, MD, MBASports Neurology & Brain Injury MedicineLast reviewed: June 24, 20266 min read

Baseline and ImPACT testing are useful tools that are widely oversold. Understanding what they can and cannot do keeps them in their proper place: one input into a clinical decision, never the decision itself.

What baseline testing actually is

Baseline testing is a pre-season snapshot of an athlete’s normal, healthy brain function — typically reaction time, processing speed, memory, and attention, sometimes paired with balance and eye-movement screening. The idea is simple: if the athlete is later concussed, you can compare their post-injury scores against their own healthy baseline instead of against population averages. The most widely used computerized battery, ImPACT, is FDA-cleared as a device to aid in the assessment of concussion — note the words "aid in." It is a tool, not a verdict.

What baseline testing is good for

An individual baseline can be genuinely useful. A "normal-looking" post-injury score can still represent a meaningful drop for an athlete who started well above average — and baseline data helps catch that. Serial testing through recovery can also add an objective data point to track a trajectory, particularly valuable with adolescents, who are known to under-report symptoms when they are motivated to get back on the field.

What baseline testing cannot do

Here is the honest part that test vendors rarely lead with:

• It does not diagnose a concussion. Concussion is a clinical diagnosis. No computerized score, by itself, confirms or rules out a concussion.
• It does not clear an athlete to return. Returning to baseline is one piece of converging evidence — alongside symptoms, the physical exam, balance and vestibular-ocular findings, and performance through a graduated protocol.
• It is not required for good care. The American Medical Society for Sports Medicine position statement is explicit that baseline testing is not required to manage a concussion. Good clinical care does not depend on it.
• It can be gamed — though less easily than people think. "Sandbagging" (deliberately scoring low at baseline to set an easy bar) is a real concern, but a controlled study found that most athletes who tried could not do it without being caught by the test’s validity checks — only a small minority succeeded. Effort and validity still matter.
• Cognitive tests miss the visual and vestibular picture. A purely cognitive battery can look normal while the athlete still has convergence, gaze-stability, or balance deficits driving their symptoms — which is why a brief vestibular/ocular screen belongs alongside it.

Where testing fits in a real return-to-play decision

In a well-run program, neurocognitive testing is interpreted inside the clinical picture, not in place of it. The Amsterdam 2022 consensus frames tools like the SCAT6 and adjunctive testing as components of a multidimensional assessment — symptoms, exam, balance, vestibular-ocular function, and graded exertion all inform the decision. Testing supports the graduated return-to-play protocol; it does not replace the clinician who runs it.

For teams, schools, and programs

Baseline testing can add value to a concussion program — but only when it is built into a real protocol: who tests, how validity is checked, who interprets results, and how testing connects to clinical evaluation and clearance. Done as a checkbox, it creates false reassurance. Done well, it is one useful instrument in a broader system. That program design — not the test alone — is what protects athletes. (See concussion program consulting and team neurology support.)

Frequently asked questions

Is concussion baseline testing required?

No. The American Medical Society for Sports Medicine states baseline testing is not required to manage a concussion. It can add a useful individualized data point, but good clinical care does not depend on it, and concussion remains a clinical diagnosis.

Does a normal ImPACT score mean I am cleared to play?

No. Returning to baseline is only one piece of evidence. Clearance is a clinical decision that also weighs symptoms, the neurological exam, balance and vestibular-ocular findings, and performance through a graduated return-to-play protocol. No single score clears an athlete.

Can athletes fake their baseline test to return sooner?

Deliberately scoring low at baseline (sandbagging) is a real concern, but a controlled study found most athletes who tried were caught by the test's validity indicators, and only a small minority succeeded. Proper administration and effort checks reduce the risk.

What does baseline cognitive testing miss?

Purely cognitive batteries can appear normal while an athlete still has convergence, gaze-stability, or balance problems that drive symptoms. That is why a brief vestibular/ocular screen should accompany neurocognitive testing rather than standing in for a full evaluation.