What every parent should know about youth concussion baselines.

Youth concussion testing has a problem most parents never see. The tools are widely deployed. The protocols are standardized. The athletic trainers running them are, in my experience, thoughtful people who care about your kid. And the program your school uses still misses roughly half of injuries, sends some athletes back to play before they are ready, and quietly accumulates the kind of cumulative exposure that shows up twenty years later as a problem nobody connected back to a Tuesday-night freshman game. This guide explains what a baseline concussion test actually does, why some athletes deliberately fail their own baselines, what your state's law covers (and what it does not), and four questions worth asking before the season starts.

What a baseline test is

Before contact sports season, your child completes a baseline concussion assessment. The idea is straightforward: brain function after an injury is hard to read against a population average because individual variation is wide, so the medical team records what your child looks like uninjured first. If a concussion is later suspected, the post-injury assessment is compared against your child's own preseason numbers rather than against a generic norm. A meaningful deviation suggests the brain is not where it usually is, and that deviation drives the return-to-play decision.

The methodology behind that approach is sound. Comparing a person to themselves is more sensitive than comparing them to a group, which is also how training-load monitoring works, heart-rate-variability monitoring works in cardiology, and how clinicians titrate doses for chronic conditions. The concept is not where the problem lives.

The problem is what the baseline is allowed to measure.

Why athletes deliberately fail their own baselines

Picture your kid as the starting wide receiver, the goalkeeper, the catcher, the point guard. The team's season depends on her. She has been working toward varsity since youth ball.

At the start of the season she sits down at a school laptop for the baseline test. Memory recall, processing speed, reaction time, a balance section, a symptom checklist that asks how often she has headaches at rest. She already knows that if she takes a hit later in the season, this is what her post-injury numbers will be compared against. She also knows the trainer who runs the comparison is the same trainer who decides when she goes back in.

So she puts up a deliberately mediocre baseline. She holds the button a beat too long on the reaction-time tasks. She misses a memory item or two she could have gotten. She reports a couple of mild symptoms she does not actually have. Two months later, after a hit in the second quarter, the post-injury comparison goes up against a baseline that already looked impaired, and she clears.

This is not a thought experiment. The behavior has been in the peer-reviewed literature for more than a decade, under the name baseline sandbagging.^[1][2] The same body of research describes the inverse pattern, post-injury concealment, where an athlete who took a real hit overperforms afterward to clear faster. Both patterns happen, every season, at every level of contact sport. Athletic trainers in multiple programs have told me on background that they can usually name two or three kids per team who run one or both plays.

Our founder, Justin Bordner, has talked publicly about doing this himself as a high school and college athlete:

I faked impact tests. I gamed the balance and the Sway screens. So did people I played with. Not because we were negligent, but because the system asked an athlete who loves the game to self-report the one thing that takes them out of it.

It is not a question of good kids versus bad kids. It is what happens when you ask a teenager who lives for the sport to voluntarily flag herself as too hurt to play.

What "objective" actually means

When a baseline tool calls itself objective, the question worth asking is which numbers in the output the child can consciously change.

Reaction time on a button press is voluntary. She can press slower or faster. How long she holds a balance stance is voluntary. She can stand still or let herself wobble. How she rates a headache on a zero-through-six symptom scale is voluntary. She can underreport or overreport.

The latency of a saccadic eye movement to a target is not voluntary. She cannot consciously slow or speed it. The speed at which her pupil constricts when a light flashes is not voluntary either; there are no nerves from her conscious mind to the iris sphincter. The high-frequency micro-corrections her body makes underneath her while she tries to stand still are not voluntary; her cerebellum and vestibular nuclei run that loop below awareness. The beat-to-beat variability of her heart is not voluntary; her autonomic nervous system runs it and does not take instructions from the part of the brain that decides whether to come out of a game.

Tools that anchor on the second list are reading the brain. Tools that anchor only on the first list are reading the athlete's decision about whether to be read.

What your state's law actually says

All fifty United States have a concussion-protection law for youth athletes. They are not identical. They share a common scaffold that emerged from the Lystedt Law in Washington State in 2009, but the specifics differ.^[3] The questions worth knowing the answers to in your state:

• Is a baseline test legally required for your child's sport and age group? In most states it is recommended but not required.
• Who is authorized to clear an athlete for return to play? In almost all states this is a licensed healthcare provider, but the specific licensure permitted varies (MD, DO, NP, PA, chiropractor, athletic trainer all vary by state).
• What is the mandatory minimum stand-down period after a suspected concussion? In some states this is hours, in others it is a fixed multi-day return-to-play progression.
• Are coaches required to remove an athlete with a suspected concussion from play? Almost universally yes.

Knowing your state's law is the foundation. It is also the floor, not the ceiling. The school's athletic department may exceed the legal minimum. Or it may match the legal minimum exactly. You want to know which.

What the Return-to-Play protocol looks like

Almost every modern concussion protocol uses a graduated return-to-play sequence. The most commonly cited is the five-stage progression originally codified in the Berlin consensus statement and updated in subsequent international symposiums.^[4] The stages typically run:

1. Symptom-limited daily activity. The athlete does ordinary school and household activities only, with no exertion that provokes symptoms.
2. Light aerobic exercise. Walking, light stationary biking. Heart rate kept below a defined fraction of maximum.
3. Sport-specific exercise without contact. Running, skating, ball drills with no head impact risk.
4. Non-contact training drills with progressive resistance and cognitive load.
5. Full-contact practice after medical clearance.
6. Return to game play.

Each stage is supposed to take at least 24 hours and the athlete cannot proceed if symptoms return. Progressing too quickly is one of the documented contributors to second-impact syndrome and to prolonged post-concussive symptoms.^[5][6]

That progression is the same regardless of which baseline tool the program uses. What the baseline tool decides is whether your kid enters the progression in the first place, and whether she exits it at the end. If the baseline is gameable, every stage downstream of it inherits the same flaw.

The four questions to ask before the season

Bring these to your child's athletic trainer, school nurse, or league medical director before contact season starts. The conversation should be brief and friendly. Most trainers are thoughtful people who appreciate parents who are paying attention.

What you can do at home

Three things, in rough order of how useful they are.

Watch the helmet conversation carefully.Helmets and mouthguards reduce skull fracture and dental risk. They do not prevent concussion. A concussion is caused by the brain accelerating inside the skull, not by the skull being struck directly. Better helmets are still better. But marketing that implies a helmet prevents concussion is marketing.^[7]

Watch cumulative exposure, not just the visible hits. Sub-concussive impacts compound across a career. A kid who has "never had a concussion" but has played twelve seasons of tackle football may carry more long-term risk than a teammate who had one diagnosed concussion across three.^[8][9] This is the part that is hardest to intuit and most important to know.

Trust the eyes and the sleep more than the speech. A kid who says she is fine but whose eye movements look different, whose balance has changed, who is sleeping notably more or less than usual, who has headaches at rest, or whose temperament shifts is the kid to watch. Self-reported "I am fine" means almost nothing. Observed change in behavior and in bodily function means a lot.

What is coming

The next generation of concussion assessment anchors on signals the athlete cannot consciously change. The front-facing camera on a current smartphone can pick up pupillary reflexes, saccadic latency, postural micro-corrections, and heart-rate variability from a thirty-second video.^[10][11] Those are involuntary biomarker channels. By the end of the decade, the athletic trainer on a sideline will not be holding a stopwatch over a kid reading a card. She will be holding a tablet that watches.

That is the work my colleagues and I are doing at Chronic Trace. We are research-stage Software-as-a-Medical-Device. We are not FDA-cleared. We are not a diagnostic device. The platform we are building fuses several established involuntary biomarker channels into a single longitudinal index that compares each athlete back to herself. The gaming-resistance comes from the design. The clinical validation that turns design into evidence is still in flight.

Until that kind of work lands and replaces what is on the sideline today, the four questions above are the best tool you have. Use them. They are the difference between protecting your child's brain and protecting the program's compliance paperwork.