Last updated: September 2026

Clinically reviewed by Dr James J Mulvany, General and Developmental Paediatrician, September 2026

It is somewhere after eleven. You have just answered six questions on a website you found through a search you have run before and closed before, and the result has told you your symptoms may be consistent with adult ADHD. You are sitting with that, and with the two thoughts that arrive immediately behind it: does this actually mean anything, and what am I supposed to do with it.

An online ADHD test is a screening tool. A screening tool is designed to do one job: sort people into “worth looking at properly” and “probably not”. It is not designed to tell you whether you have ADHD, and the good ones do not claim to.

What the six questions are actually measuring

The screener you are most likely to have completed, if you completed a real one, is a six-item questionnaire developed by the World Health Organization: the Adult ADHD Self-Report Scale, usually shortened to ASRS (Kessler et al., 2005). It is the short form of a longer eighteen-item scale, and it asks about six specific things.

Not symptoms in the abstract. Six ordinary situations: finishing the fiddly last part of a task once the interesting part is done, getting things into order when a task needs organising, remembering appointments and obligations, starting something that requires sustained thought, fidgeting when you have to sit for a long time, and feeling driven to keep moving as though something has switched you on.

The scoring is deliberately blunt. Each question has a threshold, set higher on some items than others, and answering at or above it counts as one mark. Four or more marks makes the screen positive. There is no percentage and no score out of a hundred, because neither is something six questions can support.

Notice what is not in there. Nothing about your childhood. Nothing about whether these things have caused you real difficulty at work or at home, or in more than one setting, or for more than six months. Nothing about whether something else could explain them: a thyroid problem, sleep debt, depression, anxiety, grief, perimenopause, or the ordinary consequences of a life with too much in it. Those questions are the assessment. The screener is the doorbell.

A positive result means something. It does not mean what you think.

Here is where the numbers matter, and where almost nobody publishes them.

In the study that validated it, the six-item screener correctly identified 68.7% of adults who did have ADHD, and correctly cleared 99.5% of those who did not (Kessler et al., 2005). Read those two figures again, because they are lopsided in a way that changes how you should treat your result.

A positive screen is a strong signal. With specificity at 99.5%, false positives are uncommon. If you screened positive, the questionnaire is not being generous with you. Australia’s national ADHD guideline is direct about what should follow: individuals who screen positive should undergo further diagnostic assessment (AADPA, 2022).

A negative screen is much weaker reassurance. Sensitivity of 68.7% means the screener misses close to one in three adults who do have ADHD. If you have spent years suspecting something and a six-question test has just told you no, that test is not able to close the question. This is the single most useful thing to understand about online ADHD screening, and it is almost never said, because “you might still have it” makes for a poor headline.

Most of the free tests you will find are not this

Search “free ADHD test” and you will get pages of quizzes. A small number are the WHO screener, presented properly. Most are not.

The signs of a poor one are consistent. It does not name the instrument it is based on. It gives you a percentage or a score out of a hundred, which no validated ADHD screener produces. It never tells you where its threshold sits or where the threshold came from. It asks you for an email address before showing your result. It tells you which “type” of ADHD you have, which is a diagnostic call that a self-report questionnaire is not capable of making. Or it is a checklist of relatable traits, every one of which describes an ordinary tired adult, engineered so that almost everyone screens positive.

That last one is the common failure, and it is worth naming plainly: a test that everyone passes has told you nothing about yourself.

An assessment is a conversation about your history, not another questionnaire.

Why you cannot simply be screened, and why that is deliberate

A reasonable next thought is that if screening is cheap and quick, everyone should have it, and the question would be settled.

Australia’s guideline takes the opposite position, and the reasoning is worth following. Universal screening for ADHD is not recommended at a population level, because current screening tools are not accurate enough and because the cost of what follows has not been established (AADPA, 2022). At the scale of a whole population, even a small false positive rate produces a very large number of people sent for assessments they did not need, in a system where the people who do need them are already waiting.

Targeted screening is different. The guideline supports screening within higher-risk groups: people with a close relative who has ADHD, people already under care for another mental health condition, people whose treatment for something else is not going the way it should (AADPA, 2022). If you have arrived at this page because your child was recently assessed, you are describing exactly that situation.

What comes after a positive screen in Australia

Who makes the diagnosis is less fixed than it used to be. Psychiatrists, paediatricians and psychologists all assess and diagnose adult ADHD, and in some jurisdictions neurologists do as well.

GPs are increasingly part of it, under accredited training programs with eligibility criteria and monitoring requirements attached rather than a free hand. New South Wales allowed trained GPs to continue stimulant prescriptions for patients on stable doses from September 2025. Queensland extended specialist GP prescribing to adults from December 2025. Western Australia went furthest in May 2026, allowing GPs who complete its training program to assess, diagnose and initiate treatment for patients aged ten and over. Other states are building similar pathways (AADPA, 2026). We have written separately about what expanding GP prescribing does and does not solve.

One distinction is worth holding onto: diagnosis and access to medication are not the same door. A psychologist can diagnose ADHD but cannot prescribe, and in several states a prescription still depends on a psychiatrist or paediatrician being involved. If medication is likely to be part of the conversation, that shapes who is worth seeing first. What actually gets prescribed, and how it is used, is covered in ADHD medication in Australia.

The practical consequence for you is that the pathway depends on where you live, and it is moving. A GP appointment is still the sensible first step in most of the country: they can rule out the things that imitate ADHD, which is genuinely part of the work rather than an obstacle placed in front of it, and they can refer you on.

A proper assessment is not another questionnaire. It is a structured clinical interview that takes your history back to childhood, examines how the symptoms have affected your functioning across more than one part of your life, and works through what else could account for them. It is the part the screener cannot do, and it is why the screener exists only to get you to it. If you want to know what that appointment actually involves before you book one, we have written it up in detail: adult ADHD diagnosis in Australia.

When to bring this to clinic

The question is worth taking further once it has started to cost you something.

In clinic that usually sounds like one of a few things. Work piling up faster than you can clear it. The same argument happening at home, over and over. A course started and not finished, again. Or you are already being treated for anxiety or depression and it is not helping as much as it should, which is one of the more common ways adult ADHD comes to light.

It also counts if you screened positive and the questions felt uncomfortably familiar. And it counts if you screened negative and that changed nothing, because six questions cannot rule ADHD out.

You do not need to be sure before you book. Most people we see are not. Working out whether it is ADHD, something else, or both, is what the assessment is for.