You've booked your ADHD brain screening — or you're seriously considering it. Either way, there's a good chance your head is full of questions. What actually happens? Will it hurt? Do I need to do anything beforehand? What if the results show nothing? And the big one: is this going to be worth it?
We hear these questions every single day. From parents bringing teenagers before GCSEs. From adults who've spent decades wondering why everything feels harder than it should. From professionals who mask all day and crash all evening. The questions are different, but the underlying feeling is the same — a mixture of hope, anxiety, and the need to finally know.
This guide covers the five most important things you need to understand before your qEEG brain screening. Not vague reassurances — practical, detailed information that will help you arrive prepared, relaxed, and confident that you're going to get the most from your appointment.
1. A brain screening is not a diagnosis — and that's actually a strength
This is the single most important thing to understand before you arrive. A qEEG brain screening provides objective neurological data. It is not a diagnosis.
Under NICE guidelines (NG87), a formal ADHD diagnosis in the UK must be made by a specialist clinician — typically a psychiatrist, paediatrician, or clinical psychologist — who assesses the full clinical picture. That includes your developmental history, current symptoms, how those symptoms affect your life across multiple settings, and whether other conditions could explain what you're experiencing.
No single test — not a questionnaire, not a computer task, not a brain scan — can diagnose ADHD on its own. The NICE clinical guideline is explicit about this: a diagnosis should not be based solely on rating scales or observational data.
So why get a brain screening at all?
Because the diagnostic pathway in the UK is broken. NHS CAMHS waiting lists stretch to 3–5 years in many areas. Adult ADHD assessments through the NHS are frequently over 2 years. Even Right to Choose providers are now seeing significant backlogs. You're often waiting years just to have a conversation with someone qualified to assess you.
A qEEG brain screening gives you something concrete now. Measured brain activity. Z-scores against published normative databases. Attention performance data. A professional PDF report with peer-reviewed citations that your GP, school SENCO, or private clinician can use immediately.
It doesn't replace the clinician — it empowers the clinician. It gives them objective data to work with, rather than relying solely on self-report and subjective questionnaires. Research published in CNS Neuroscience & Therapeutics (2025) found that combining qEEG power bands with attention testing significantly enhances diagnostic accuracy for ADHD, with predictive models achieving adjusted R² values between 71.5% and 87.1%.
Our results explained guide walks you through every metric in plain English — what the numbers mean, what they don't mean, and how to present them to professionals.
2. What you do in the 24 hours before matters more than you think
A qEEG measures the electrical activity your brain produces naturally. It's extraordinarily sensitive — which is exactly what makes it useful. But that sensitivity means that what you consume, how you sleep, and what you put on your hair can all affect the quality of the recording.
Here's your preparation checklist:
Caffeine
Avoid caffeine for at least 4 hours before your appointment. Ideally, skip it entirely on the day. Caffeine is a central nervous system stimulant that directly increases beta wave activity and suppresses theta — the exact frequencies we're measuring. A double espresso before your scan could artificially compress your theta/beta ratio, potentially masking the very pattern we're looking for. This includes coffee, tea, energy drinks, pre-workout supplements, and cola. If you're a heavy caffeine user and concerned about withdrawal headaches, have your last cup the evening before.
Medication
This is the question we get asked most often, and the answer depends on what you want the screening to show.
If you're not currently on ADHD medication, there's nothing to consider — just attend as normal.
If you are currently taking stimulant medication (methylphenidate, lisdexamfetamine, dexamfetamine), you have two options. If you want a baseline reading of your unmedicated brain, skip your morning dose on the day of the appointment — but only with your prescriber's knowledge and agreement. If you want to see what your brain looks like on medication versus off, our medication comparison scan captures both states in a single session, giving you a direct before-and-after comparison.
Non-stimulant medications (atomoxetine, guanfacine) work differently and don't need to be stopped. If you're on antidepressants, anti-anxiety medication, or any other psychoactive medication, take them as normal — we account for these in the clinical interpretation.
Sleep
Get a reasonable night's sleep. You don't need 8 perfect hours — this isn't a sleep study. But severe sleep deprivation (under 4 hours) increases slow-wave theta activity regardless of whether you have ADHD, which can muddy the clinical picture. If you have ADHD-related sleep problems and poor sleep is your norm, that's fine — we expect that, and it's part of the clinical context.
Hair and scalp
Wash your hair the morning of your appointment. Clean hair gives the dry electrodes the best possible contact with your scalp. Avoid heavy styling products — gel, wax, hairspray, dry shampoo, leave-in conditioner. These create a barrier between the electrode and your skin that can introduce noise into the recording. A simple shampoo and towel dry is perfect. If you have braids, locs, or extensions, get in touch beforehand and we'll advise on the best approach for your hair type.
Food and hydration
Eat normally. Don't attend on an empty stomach — low blood sugar affects concentration and can alter brainwave patterns. Don't overeat either. A normal breakfast or lunch is ideal. Stay hydrated. Dehydration can increase muscle tension artifacts in the EEG signal.
3. The appointment itself is shorter, simpler, and less clinical than you expect
Most people picture something medical. A hospital gown. Cold gel. Wires everywhere. Lying still for an hour. The reality is nothing like that.
The entire appointment takes about 30 minutes. You sit in a comfortable chair in a quiet, non-clinical room. There's no hospital. No waiting room full of strangers. No clipboard of forms to fill in before you start.
We place a lightweight headband — the BrainBit device — on your head. It has four small, dry electrodes that rest gently against your scalp. No gel. No paste. No needles. No conductive fluid dripping down your neck. Most people say it feels like wearing a snug beanie hat. Children and teenagers tolerate it easily.
The recording itself takes just 7 minutes:
- 2 minutes eyes open — you look at a simple cross on screen while the device captures your resting brain activity. This measures your baseline cortical arousal — how active your brain is when it's supposed to be calmly focused.
- 2 minutes eyes closed — you relax with your eyes shut. The transition between eyes-open and eyes-closed states reveals important patterns in how your brain shifts between alertness and rest. In ADHD, this transition often looks different from the neurotypical pattern.
- 3 minutes Go/No-Go task — a simple game appears on screen. Green circles mean press the button. Red squares mean don't press. It's straightforward, but it measures three critical functions: sustained attention (can you keep responding accurately over time?), impulse control (can you stop yourself pressing when you see red?), and response consistency (how variable is your reaction time?).
That's the entire recording. Seven minutes. Cap off. Done.
During the recording, you can see your own brain waves moving across the screen in real-time. Most people — especially teenagers — find this genuinely fascinating. It's one thing to be told your brain works differently. It's another to see the electrical activity yourself, live, as it happens.
After the recording, we walk you through the initial data on screen. We explain what the theta and beta frequencies represent, what your ratio looks like compared to the age-matched norms, and what the attention task metrics show. You leave understanding what the data means — not clutching a report full of numbers you can't interpret.
The full professional PDF report is generated and emailed to you the same day. It includes your raw data, z-scores against published normative databases from 311+ research subjects, attention task performance breakdown, clinical interpretation, and peer-reviewed citations. It's designed to be understood by GPs, psychiatrists, SENCOs, EHCP panels, and — crucially — by you.
30 minutes. Same-day results. No referral needed.
Objective brain data you can take to your GP, school, or clinician. From £595.
Book your screening →4. Understanding what the results actually measure — and what they don't
Your report centres on two core datasets: resting-state brainwave analysis and attention task performance. Understanding what these mean before your appointment will help you interpret the results with confidence — and present them effectively to professionals.
The theta/beta ratio
Your brain produces electrical oscillations at different frequencies. Two of these are particularly relevant to ADHD:
- Theta waves (4–8 Hz) — slow-wave activity associated with daydreaming, mind-wandering, and unfocused states. Everyone produces theta. But in a significant subgroup of people with ADHD, the brain produces excessive theta during tasks that demand focus.
- Beta waves (13–30 Hz) — faster activity associated with active concentration, alertness, and engaged thinking. In the same ADHD subgroup, beta is often suppressed relative to what you'd expect for their age.
The ratio between these two — the theta/beta ratio — is one of the most studied neurophysiological markers in ADHD research. A large body of peer-reviewed evidence, including meta-analyses published in the Journal of Attention Disorders, has consistently found elevated theta/beta ratios in ADHD populations, with early studies reporting sensitivity above 85% and specificity above 90%.
Your results are expressed as z-scores — standard deviations from the mean for your age group. A z-score of 0 means your theta/beta ratio is exactly average for someone your age. A z-score of 2.0 means your ratio is 2 standard deviations above the norm — a clinically significant finding that places you in approximately the top 2.5% of the population for that metric.
It's worth understanding that the research landscape is nuanced. More recent large-scale analyses have shown that the theta/beta ratio is not universally elevated in all ADHD presentations — it characterises a substantial subgroup rather than every individual. A 2024 study published in Frontiers in Psychiatry found that elevated theta/beta ratios correlated significantly with attention capacity in ADHD children, but the strongest differences emerged when combining EEG data with behavioural attention testing — which is exactly what our protocol does.
This is why we never report the theta/beta ratio in isolation. The attention task data provides a second, independent measure of how your brain performs under demand.
The Go/No-Go attention task
The attention task measures four key metrics:
- Hit rate — how many green circles you correctly responded to. This measures sustained attention — your ability to maintain focus over the full 3 minutes.
- Miss rate (omission errors) — how many green circles you failed to respond to. High miss rates indicate attention lapses — moments where your brain disengaged from the task.
- False alarm rate (commission errors) — how many red squares you pressed when you shouldn't have. This measures impulse control — the ability to inhibit a prepotent response.
- Reaction time variability — how consistent your response speed was across the task. High variability is one of the most reliable cognitive signatures of ADHD, reflecting the moment-to-moment fluctuations in attention that define the condition.
Together, the resting-state data and the attention task create a comprehensive neurocognitive snapshot — two independent lines of evidence that either converge (both suggesting atypical patterns) or diverge (providing a more nuanced picture). Both outcomes are clinically useful.
What the results don't tell you
The screening does not measure IQ. It does not diagnose autism, dyslexia, anxiety, or depression — although it can reveal brainwave patterns that suggest further investigation may be warranted. It cannot tell you whether medication will work for you specifically, although our medication comparison scan can show how your brain responds to stimulant medication versus your unmedicated baseline.
The screening provides neurological data. A clinician provides the clinical judgement. When the two work together, the assessment process becomes faster, more robust, and more objective than either alone.
5. Know exactly what you're going to do with the results before you arrive
This is the thing most people don't think about — and it's the difference between a report that gathers dust in your inbox and one that genuinely changes your trajectory.
Before your appointment, decide which pathway you're pursuing. Not vaguely — specifically. Write it down. Because when you have the report in hand on the same day, you want to act immediately while the momentum is there.
Pathway 1: GP referral for formal assessment
If you want a formal ADHD diagnosis through the NHS, your GP is the gatekeeper. And GPs respond to objective data far more readily than they respond to self-diagnosis or online questionnaire results.
Our GP appointment guide includes word-for-word scripts for presenting your results. The approach is simple: show the z-scores, explain they come from a qEEG recording measured against published age-matched norms, and request a referral. Many GPs are unfamiliar with qEEG, but they understand z-scores and standard deviations — it's the same statistical language used in blood tests, growth charts, and every other medical measurement they work with daily.
If your GP is supportive, ask specifically about Right to Choose. Under this legislation, your GP can refer you to a private assessment provider — such as Psychiatry-UK — for formal assessment funded by the NHS. This can reduce your wait from years to months. Our report provides exactly the kind of objective supporting evidence that helps GPs feel confident making this referral.
Pathway 2: School support and exam access
If you're a parent pursuing support for your child, the report goes to the school's SENCO. Under JCQ access arrangements, students with evidence of attentional difficulties can receive 25% extra time, rest breaks, a separate room, use of a word processor, and other accommodations. The school needs documented evidence of need — and z-scores against published norms are precisely the kind of evidence that JCQ panels are designed to evaluate.
For EHCP applications, the report provides objective neurological data that strengthens the evidence base. EHCP panels assess whether a child's needs are supported by professional evidence. A qEEG report — with its normative comparisons, attention metrics, and clinical interpretation — provides a line of evidence that subjective observations alone cannot match.
Book the SENCO meeting for the week after your screening appointment. Don't wait. Our GCSE support guide covers the complete process of turning brain data into school accommodations.
Pathway 3: Private clinical assessment
If you're going private for a full diagnostic assessment, your qEEG report becomes part of the evidence package the clinician reviews. Many private psychiatrists and clinical psychologists actively welcome objective neurological data — it gives them an additional dimension beyond self-report and behavioural observation.
Our comprehensive assessment package (£845) includes the full qEEG screening plus a detailed clinical letter written specifically for referral purposes — designed for GPs, psychiatrists, EHCP panels, and JCQ applications.
Pathway 4: Personal understanding
Not everyone who books a screening is pursuing a formal diagnosis. Some people simply want to understand their brain. After years — sometimes decades — of feeling different, struggling with focus, battling executive function, and wondering "is it me or is it something else?", seeing the data can be profoundly clarifying.
An elevated theta/beta ratio doesn't define you. But it can reframe years of self-blame into self-understanding. "Why can't I just focus like everyone else?" becomes "My brain's electrical balance is measurably different from the norm — and there are strategies and support systems designed specifically for brains like mine."
Our coping strategies guide covers practical techniques that work with the ADHD brain. Our support hub is a 14-page resource library covering everything from ADHD in women to the parent's guide to ADHD in the workplace.
"I spent 34 years thinking I was lazy and broken. Seeing my brain activity on screen — seeing the theta waves dominating where beta should have been — was the first time something made sense. I cried in the car park. Not because I was sad. Because I finally had proof it wasn't my fault."
What happens after the screening
You'll leave with a clear understanding of what the data shows. Your full report arrives by email the same day — a professional PDF containing your resting-state brainwave analysis, theta/beta ratio z-scores, attention task breakdown, clinical interpretation, and references to the peer-reviewed research underlying the methodology.
From there, the ball is in your court. Book the GP appointment. Call the SENCO. Send the report to your private clinician. Or simply sit with the data and decide your next step in your own time.
If you need guidance on next steps after receiving your results, our results explained guide and GP appointment guide walk you through every option. And if you have questions between now and your appointment, get in touch — we respond to every enquiry personally.
The question behind all the other questions
Every question people ask before their screening — will it hurt, how long does it take, what do I need to avoid — is really a proxy for one deeper question: is this going to give me answers?
We can't promise you a diagnosis. We wouldn't want to — that's not our role, and any service that promises you a diagnosis from a single test is one you should walk away from. What we can promise is objective, measured, peer-reviewed brain data that moves your understanding forward. Data that GPs, psychiatrists, schools, and EHCP panels take seriously. Data that replaces speculation with science.
Whether that data shows elevated theta/beta and impaired attention metrics — strongly suggesting further investigation is warranted — or whether it shows a neurotypical pattern — which is equally useful information that redirects your search — you leave knowing something real. Something measured. Something that didn't exist before you walked through the door.
And in a system where you can wait years just to have someone listen, that matters.
Frequently asked questions
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