Not medical advice
Northsignal is for general education about ADHD and focus health. It does not diagnose, treat, or prescribe, and it is not a telehealth provider or affiliated with one. Talk to a licensed clinician about evaluation and treatment. Full disclaimer
Testing guide
ADHD testing & diagnosis, demystified
There’s a big difference between a five-minute screener and a diagnosis. This guide explains what each one actually tells you, who can diagnose, what a proper evaluation includes, roughly what it costs, and how to walk in prepared.
Table of Contents
Screeners: the starting point, not the answer
A screener is a short, validated questionnaire that estimates whether your experience is consistent with ADHD symptoms — nothing more. It’s the difference between a smoke detector and a fire investigation: useful for telling you whether to look closer, useless for telling you what actually happened.
The ASRS v1.1, explained
The most widely used adult screener is the Adult ADHD Self-Report Scale (ASRS v1.1), developed with the World Health Organization.[1] The short form is six questions about the past six months — things like how often you have trouble wrapping up final details of a project, or how often you’re distracted by activity around you. It takes under five minutes, and it’s scored by how many answers cross a frequency threshold, not by a “percentage ADHD.”
Two honest caveats. First, the ASRS is deliberately tuned to be sensitive — it errs toward flagging people so fewer cases are missed, which means a positive screen is common and expected to include people who don’t have ADHD. Second, it asks about now; it can’t see your childhood, which diagnosis requires. Both are reasons a positive screen means “worth evaluating,” never “confirmed.”
Who can actually diagnose ADHD
Rules vary by country and state, but broadly, diagnosis requires a licensed clinician operating within their scope:
- Psychiatrists — medical doctors; can diagnose and prescribe. Often the most direct route for adults, especially when medication may be discussed.
- Psychologists — can perform thorough diagnostic evaluations, including structured interviews and (where useful) neuropsychological testing; cannot prescribe in most regions.
- Primary care physicians / GPs — some evaluate and manage ADHD, especially uncomplicated cases; many prefer to refer to a specialist. A good first call either way, and often required for referrals or insurance.
- Psychiatric nurse practitioners — in many regions can evaluate and prescribe, commonly through telehealth services.
Telehealth evaluation is legitimate when it’s a real clinical assessment done by a licensed provider — the medium isn’t the issue; the thoroughness is. Which brings us to what “thorough” means.
Inside a full evaluation
A proper adult ADHD evaluation isn’t one questionnaire and a prescription. Expect most of the following, typically across one to three appointments:[2][3]
Structured clinical interview
A systematic walk through DSM-5-TR criteria: which symptoms, how long, how severe, in which settings, and with what real-world cost.
Childhood history
Diagnosis requires symptoms before age 12 — so expect questions about school years, report cards, and what teachers and parents used to say.
Rating scales — often from others too
Standardized scales you complete, sometimes alongside a partner, parent, or close friend who can describe you across settings.
Screening for other conditions
Anxiety, depression, sleep disorders, and substance use are checked — both as look-alikes and as common co-occurring conditions.
Medical context
Health history and sometimes basic checks (e.g., thyroid, sleep) to exclude physical causes of attention problems.
Neuropsychological or computerized testing (like continuous performance tests) is sometimes added, but it’s not required for diagnosis and can’t make one on its own — the clinical interview remains the core of the process.
What gets ruled out — and why it matters
Attention problems are a symptom, not a diagnosis. Several conditions can look remarkably like ADHD, and several commonly travel with it: sleep apnea and chronic sleep deprivation, anxiety and depression, thyroid dysfunction, trauma responses, and substance effects. A careful evaluation distinguishes “ADHD,” “something else,” and — frequently — “ADHD plus something else.” Getting this wrong in either direction leads to the wrong help.
“You can get a legit ADHD diagnosis from a 10-minute online quiz.”
No — and services promising instant diagnosis after a brief questionnaire are a red flag, not a shortcut. Legitimate telehealth evaluation exists, but it looks like the multi-step process above, done by a licensed clinician. See the Signal vs Noise entry →
Cost & access basics
Costs vary widely by country and pathway, so treat these as orientation, not quotes. In public systems (like the UK’s NHS), evaluation is covered but waitlists can be long; “right to choose” options may shorten them. With private or US insurance, a psychiatric evaluation may be partly covered — check whether the provider is in-network and whether pre-authorization is needed. Out-of-pocket private evaluations commonly run from a few hundred dollars for a psychiatric assessment to considerably more for full neuropsychological testing (which, again, isn’t usually required).
Worth asking up front: “What does your ADHD evaluation include, how many sessions, and what’s the total cost?” A legitimate provider answers plainly.
How to prepare — and strengthen your evaluation
Evaluations are only as good as the information in them. Bringing evidence makes yours sharper:
- Old school records or report cards — comments like “doesn’t finish work,” “talks constantly,” “capable of more” are gold
- A week of concrete, recent examples: missed deadlines, lost items, abandoned projects, impulsive decisions
- Input from someone who knows you well — partner, parent, longtime friend — even informally in writing
- Your health basics: medications, sleep patterns, caffeine/alcohol use, prior mental-health history
- Your questions, written down — because forgetting them in the appointment would be a little on the nose
Red flags when choosing a provider
- Diagnosis promised from a single short questionnaire, with no childhood history taken
- Guaranteed outcomes (“get diagnosed today”) or subscription pressure before any assessment
- No licensed clinician identified by name and credentials
- No screening for other conditions — a careful evaluator always checks the look-alikes
- Unwillingness to share records with your regular doctor
Next steps
Screened, prepared, and thinking about what comes after evaluation? Here’s what the research says about the options a clinician may discuss with you.
Sources
- Kessler RC, et al. The World Health Organization Adult ADHD Self-Report Scale (ASRS): a short screening scale for use in the general population. Psychol Med, 2005. doi:10.1017/S0033291704002892
- American Psychiatric Association. DSM-5-TR, 2022 — ADHD diagnostic criteria and assessment guidance.
- NICE. Attention deficit hyperactivity disorder: diagnosis and management (NG87), 2018 (updated). nice.org.uk/guidance/ng87
- Faraone SV, et al. World Federation of ADHD International Consensus Statement. Neurosci Biobehav Rev, 2021. doi:10.1016/j.neubiorev.2021.01.022