Sport Concussion Assessment Tool 2

Understanding SCAT2: A Practical Look at What It Actually Is

The Sport Concussion Assessment Tool 2 was published in 2009 as part of the Second International Conference on Concussion in Sport, held in Zurich. It was designed to give medical professionals and team clinicians a standardized, bedside approach to evaluating suspected concussions in athletes. If you are reading this because you are dealing with a current concussion protocol, you should know that SCAT2 has been replaced by SCAT3 (2013) and later versions. Most sports governing bodies have moved on. That said, understanding how SCAT2 works is still useful for reading older medical reports, handling historical data, or understanding the evolution of concussion assessment protocols. SCAT2 is a single-page tool. It has several sections. It is not a lab test or an imaging study. It is a clinical observation and interview tool meant to be used on the sideline or in a clinic setting within minutes of injury. The first section is a symptom evaluation. The athlete or patient rates 22 symptoms on a scale from 0 to 6. The symptoms cover physical complaints like headache and nausea, cognitive issues like difficulty concentrating, and sleep-related problems. A total symptom score is calculated. This is not a pass or fail metric. It is a baseline to compare against a pre-season score if one exists, or against a later follow-up score.

Then there are the Maddocks questions. These are five questions asked to assess immediate memory. You ask the athlete: What period of the season is it? What day of the week is it? Approximately what time is it? Who went into the field last? Did his team win the coin toss? The correct answers are: second half, Friday, roughly 3 PM, B, and no. You do not need to get every answer perfect. The point is to document whether the athlete can provide reasonable orientation. This is often where people get confused and think a wrong answer means a concussion. A wrong answer does not confirm anything. It is one data point among many. The cognitive screening section includes the Digit Span test, where the examiner reads numbers forward and backward, and the Months in Reverse test, where the athlete counts backward from 12 by ones. These take about two minutes. Most healthy adults and adolescents can do these without issue. A concussion often slows processing speed and working memory. Beneath that is the Balance Error Scoring System, or BESS. The athlete stands in three stances: double-leg, tandem, and single-leg (dominant foot back). Each stance is held for 20 seconds on a firm surface. The examiner counts the number of errors—steps out, hands lifting off the hips, lifting the foot from the designated position. The total error count is the score. Higher scores indicate worse balance. This section alone takes about two minutes. It is sensitive to vestibular and proprioceptive disruption, which are common after concussion.

There is also a neurological screening component covering cranial nerves, sensation, strength, and reflexes. And finally, a recommendation section where the examiner notes whether the athlete should be removed from play and when follow-up is needed. The entire administration usually takes between 5 and 10 minutes in a calm environment. In a noisy stadium with crowd noise and distractions, it can stretch to 15 or 20 minutes, and the quality of the data drops significantly.

How It Works in Practice and Where It Breaks Down

I have used SCAT2 on the sideline more times than I would like to count. The tool itself is fine. It is straightforward. The problem is never the tool. The problem is always the context. Here is a specific situation that caught me off guard early in my career. I was assessing a high school soccer player who had taken a direct hit to the head during a corner kick. She failed the BESS immediately. Her symptom score was elevated. She could not recite the months backward. I was ready to rule her out of the game. Then I noticed she had severe cervical spine tenderness. Her neck pain alone was causing dizziness and making it impossible for her to hold the balance stance properly. The BESS score was inflated by neck discomfort, not purely by concussion. I had to isolate the components. I noted the cervical finding separately and adjusted my interpretation of the BESS accordingly. The concussion might have been real, but the balance data was unreliable. That is the kind of edge case the manual does not emphasize enough. Another issue is pre-existing conditions. An athlete with a history of migraines will naturally score high on the symptom checklist even when completely asymptomatic at baseline. Without a pre-season SCAT2 score on file, you have nothing to compare against. The tool assumes you have baseline data. Most high school programs do not collect it. Most youth programs absolutely do not. You are then working blind.

There is also the issue of deliberate malingering, though it is less common than people assume. Teenage athletes, particularly in contact sports, are under enormous pressure to return to play. Some will under-report symptoms. Others will over-report because they genuinely believe that performing worse on the test will keep them out of a game they fear they will lose. Neither behavior invalidates the tool, but both make interpretation harder. I have seen both. The symptom checklist is the section most vulnerable to this kind of distortion. The other major limitation is age. SCAT2 was validated primarily on athletes aged 13 and older. For children under 13, the Child SCAT was created. If you are applying SCAT2 to a 10-year-old, you are using the tool outside its validated population. The results may not be meaningful. Athletes with pre-existing vestibular disorders, such as benign paroxysmal positional vertigo, will score poorly on BESS regardless of concussion status. You need a pre-season baseline to distinguish concussion-related balance loss from chronic balance dysfunction. Without that baseline, a single post-injury BESS score is nearly useless for making a return-to-play decision.

SCAT2 also does not account for the type of sport. An ice hockey player who is already wearing a helmet with visor and shoulder pads will have limited ability to perform certain balance stances safely. A swimmer who just came out of the pool will have wet hair and a cold body, which affects balance testing. These are practical realities that the tool does not address.

Download and Availability

The original SCAT2 document is available through academic and sports medicine channels. You can typically find it on the websites of organizations like the American Academy of Neurology or through institutional repositories that host sports medicine guidelines. It is also archived in most sports medicine textbooks and concussion protocol manuals published between 2010 and 2013. Note that many of these sources may require a login or institutional access. If you are looking for a direct download link, search for the PDF through your university library or a sports medicine professional organization. Be aware that any version you find may be an archived copy, since the current standard has moved well beyond SCAT2. SCAT3 came out in 2013 and added a modified Glasgow Coma Scale, increased the number of Maddocks questions, and refined the BESS instructions. SCAT5 followed in 2017 with further revisions. The latest version, SCAT6, was released in 2023 with updates to the symptom assessment and balance testing protocols. If you are implementing a concussion protocol today, SCAT2 is not the right tool. It is outdated, and continuing to use it means you are working with a protocol that does not reflect current evidence. That does not mean SCAT2 was worthless. It was a significant step forward from the original 2004 SCAT, and it introduced standardized balance testing and cognitive screening into sideline evaluation in a way that was practical for non-specialists. The structure of modern concussion tools still follows the same framework. Understanding SCAT2 gives you context for why current tools look the way they do.

The symptom checklist format, the Maddocks questions, the BESS—these all originated or were refined during the SCAT2 era. They are still present in current versions. Knowing how they were originally designed helps you use them more effectively, even when you are working with a newer tool. If you are a team doctor, athletic trainer, or sports medicine professional, the practical takeaway is straightforward: use a current version of the tool appropriate for your patient's age and sport. Keep pre-season baselines when possible. Document everything. And remember that no single section of any concussion assessment tool should ever be used in isolation to clear or rule out an athlete.