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ADHD tests & diagnosis

How Do You Know If You Have ADHD?

Last updated 25 October 2026 · 9 min read · By Sarah M., Support Coordinator
In short

How do you know if you have ADHD? You cannot tell from a quiz or a checklist alone. Only a trained clinician can confirm it, after a thorough assessment that looks at your history, your daily life and how long symptoms have been there.

This guide explains the signs people look for, how a proper assessment works in Australia and what to do next. For the full pathway, see our guide to getting an ADHD diagnosis in Australia.

Key points

  • ADHD cannot be diagnosed online or through a quiz; a quiz can only help you reflect and decide whether to book an assessment.
  • Diagnosis needs symptoms before age 12, present for at least 6 months, and causing difficulty in at least two settings such as home, school or work.
  • Children are usually assessed by a paediatrician, child psychiatrist or psychologist, and adults need evidence that symptoms began in childhood.
  • Struggling with focus, time or motivation is not the same as being lazy, and a clinician can help you work out what is behind it.
How do you know if you have ADHD at a glance
What it isA neurodevelopmental condition affecting attention, activity levels and impulse control
How commonAround 6-8% of children and 3-5% of adults in Australia, as per the Australian ADHD Guideline
Who can assess itPaediatrician, psychiatrist or appropriately trained and credentialled psychologist or clinician
Can a quiz diagnose itNo, quizzes are for reflection only
Free health advicehealthdirect on 1800 022 222, staffed by registered nurses 24 hours a day
Official sourceAustralian ADHD Guideline (AADPA)

How do you know if you have ADHD? What the guideline looks at

The Australian ADHD Guideline describes ADHD through nine inattentive and nine hyperactive-impulsive symptoms, and the number needed depends on age (AADPA).

  • Children need 6 of the 9 symptoms in the inattentive group, the hyperactive-impulsive group, or both, to reach the diagnostic threshold.
  • People aged over 17 years need only 5 symptoms.
  • Symptoms must have been present for at least 6 months and begun before age 12.
  • Symptoms must cause real difficulty in at least two settings, for example at home and at work, not just one.

How do I know if I have ADHD as an adult?

These questions can help you reflect before talking to your GP. They are not a test.

  • Notice whether you regularly lose track of tasks, appointments or belongings even when you care about them, and whether this has been true since childhood.
  • Think about restlessness that has become an inner feeling rather than running around, such as being unable to relax or sit through meetings.
  • Look at whether you struggle to start boring tasks but can hyperfocus for hours on things that interest you.
  • Gather old school reports, because healthdirect notes they may be requested to show symptoms began in childhood.

Do I have ADHD or am I just lazy?

Laziness is a judgement, not a diagnosis. A clinician looks at the pattern behind your difficulties.

What it can look likeWhat a clinician considers
You want to start a task but cannot make yourself begin, even with a deadlineWhether this pattern is lifelong, and whether it affects more than one area of life
You finish work at the last minute or leave it unfinished despite good intentionsWhether stress, low mood, anxiety or sleep problems could be contributing

If you keep asking “am I lazy or do I have ADHD?”, that is a good reason to talk to your GP rather than keep blaming yourself.

Have I got ADHD? Using a quiz the right way

A quiz can be a useful starting point if you treat it as a prompt for reflection. ReachOut Australia states that ADHD can’t be diagnosed online or through an ADHD quiz (ReachOut Australia).

  • Use any quiz to write down examples from your own life, not to decide for yourself.
  • Take your answers and examples to your GP to help focus the conversation.
  • Remember that the guideline says rating scales can assist diagnosis but should not be used alone.

Only a qualified professional can assess this properly.

Signs of ADHD in a 3 year old, 5 year old and 7 year old: quiz questions to reflect on

These questions are for reflection only. A clinician decides whether an assessment is needed.

AgeQuestions to reflect on
3 year oldIs their activity level constant, even during quiet times, and has it caused difficulty at home or at childcare?
5 year oldDo they struggle to sit for short group activities, take turns or follow simple instructions compared with classmates?
7 year oldDo teachers report difficulty finishing work, losing belongings or calling out, and does this happen at home too?
  • Write down specific examples with dates, because clinicians want to see patterns across settings.
  • Ask the teacher or childcare educator what they see, since symptoms must show in at least two settings.

Our guide to the ADHD test for kids explains what assessments involve for children.

Looking for NDIS support at home?

TQN Care support workers help with personal care, community access, respite and help around the home across Sydney, Melbourne and surrounding areas (NSW & VIC). Tell us what you need and we will call you back.

Make a referral →

Is it ADHD or high IQ?

There is no simple online test that answers “is it ADHD or high IQ?”. A clinician looks at the overall pattern.

  • For a diagnosis, symptoms must cause difficulty in at least two settings, such as home, school or work, and this is what a clinician checks for.
  • Rating scales and test scores can assist an assessment but should not be used alone.
  • If you or your child do well at school or work but still struggle in daily life, mention this to your GP.

How to find out if you have ADHD: the assessment steps

Finding out usually takes more than one appointment.

  1. Write down your examples. List situations from home, work or school, and when you first noticed them, so you can describe your experience clearly.
  2. Book a GP appointment. Ask for a longer appointment, explain your concerns and ask whether a referral is appropriate.
  3. Collect evidence from childhood. Find school reports or ask family who knew you as a child, since symptoms must have started before age 12.
  4. See a qualified clinician. Children are usually assessed by a paediatrician, child psychiatrist or psychologist; adults see a psychiatrist or other credentialled clinician.
  5. Complete the clinical interview. The guideline notes a detailed interview may take between 2 and 3 hours (AADPA).

The same guideline notes that direct observation, neuropsychological testing, neuroimaging and EEG did not increase the accuracy of diagnosis. Our guides to how ADHD is diagnosed in adults and how they test for ADHD cover each step in more detail.

I think I have ADHD, what do I do?

Start with small, practical steps, and keep in mind that wanting an assessment is a reasonable thing to do.

  • Speak to your GP and bring your written examples, any old school reports and a list of questions.
  • Call healthdirect on 1800 022 222 to talk to a registered nurse at any hour, or 1300 39 39 19 for the ADHD Foundation (healthdirect).
  • Read about tests designed for specific groups, such as the free ADHD test for adults and the free ADHD test for women.
  • Do not start, stop or change any medicine on your own; talk to your GP, psychiatrist or pharmacist first.

Why do I have ADHD?

ADHD is a neurodevelopmental condition, which relates to how the brain develops. It is not caused by poor parenting or a lack of discipline.

  • ADHD is not a character flaw, and it does not reflect intelligence or effort.
  • Symptoms begin in childhood, even when they are only recognised in adulthood.

When to talk to a GP or specialist

You do not have to wait until things feel overwhelming. Book an appointment if any of these sound familiar.

  • Attention, restlessness or impulsiveness is affecting your work, study, friendships or family life on most days.
  • A teacher, childcare educator or family member has raised concerns about your child more than once.
  • You have felt this way since childhood.
  • Low mood, anxiety or burnout is building alongside attention difficulties.

If you are feeling overwhelmed or in crisis, call Lifeline on 13 11 14. Call 000 in an emergency or if someone is in immediate danger.

Looking for NDIS support at home?

TQN Care support workers help with personal care, community access, respite and help around the home across Sydney, Melbourne and surrounding areas (NSW & VIC). Tell us what you need and we will call you back.

Make a referral →

Next step: practical support alongside your assessment

At TQN Care, we do not diagnose or treat. Our support workers help NDIS participants with personal care, community access, respite and help around the home. If you or a family member has an NDIS plan, see our TQN Care NDIS services or make a referral and we will call you back to talk through what you need.

SM
Sarah M., Support CoordinatorTQN Care is a registered NDIS provider supporting people across Sydney, Melbourne and surrounding areas (NSW & VIC).
Common questions

FAQs about how to know if you have ADHD

How do you know you have ADHD? +

You cannot be sure without an assessment. Clinicians look for symptoms that began before age 12, lasted at least 6 months and cause difficulty in at least two settings. Your GP can refer you to the right specialist, and a quiz can only help you prepare.

Do I have ADHD or am I just lazy? +

Laziness is not a diagnosis. If you try hard but still struggle with focus, starting tasks or finishing them, and this has been true for years, talk to your GP. A clinician can look at ADHD and at other possible explanations such as stress, anxiety or poor sleep.

Do I have ADHD free test? +

Free online tests can help you reflect, but they cannot diagnose. ReachOut Australia states ADHD can’t be diagnosed online or through a quiz. Use the results to prepare for a GP appointment, and expect a proper assessment to involve a clinician and a detailed interview.

How to find out if you have ADHD as an adult? +

Start with your GP, bring examples of your difficulties and any school reports, and ask for a referral. Adults need evidence that symptoms began in childhood. A detailed clinical interview may take between 2 and 3 hours, and a psychiatrist or other credentialled clinician makes the diagnosis.

References

Sources

  1. About ADHD — Australian ADHD Guideline — AADPA
  2. ADHD diagnosis (Guideline section 2.1) — AADPA
  3. ADHD Diagnosis Checklist (PDF) — AADPA
  4. Attention deficit hyperactivity disorder (ADHD) — healthdirect Australia
  5. ADHD in teenagers — ReachOut Australia
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