Autism & Neurodiversity
Autism and ADHD Together: Questions for an Assessment Appointment
Bring clear examples and ask how an assessment considers autism, ADHD and other relevant concerns.
Archive edition: 9 May 2026 · assigned for archive organisation
Having an autism diagnosis does not automatically answer every question about attention, activity or impulsivity. Equally, difficulties with concentration do not establish ADHD on their own. If you are considering assessment for yourself or a child, the useful starting point is the pattern of experiences and their effect on everyday life.
This guide helps you prepare questions when autism and ADHD may both be relevant. It does not compare symptom lists to diagnose someone, recommend medication or promise access to a particular assessment service. The clinician’s task is to consider the whole picture, including other possible explanations and support needs.
At a glance
- Autism and ADHD can occur together; an existing diagnosis does not settle every new concern.
- Bring examples across time and settings, with the supports already in place.
- Ask how the assessor considers overlapping features and other explanations.
- Leave with clear findings, remaining questions and practical next steps.
Understand why a fuller assessment may matter
The Canadian Paediatric Society’s guidance on ADHD with coexisting conditions explains that autism and ADHD can coexist and that features may overlap or obscure one another. Its focus is children and young people; the statement was published in 2018 and reaffirmed in 2024.
This supports asking a professional to consider the concern rather than assuming that one label explains everything. It does not mean every autistic person has ADHD, or that every person with ADHD needs an autism diagnosis. Your appointment should address the reason for referral and the person’s individual circumstances.
Ask the service whether the clinician has experience assessing the relevant age group and coexisting neurodevelopmental conditions. Also ask what the appointment covers. An ADHD assessment, an autism assessment and a review of support needs may be related, but they are not necessarily the same service.
Prepare examples rather than a case to prove
Choose a few situations that show what is difficult. Describe what was expected, what happened and how the activity was affected. Include the person’s explanation where available. Keep the goal open: understanding the concern is more useful than arranging every example to support a preferred conclusion.
| Area | What to note | Question to ask |
|---|---|---|
| History | When concerns were first noticed and any relevant earlier records | What developmental information would help? |
| Different settings | Examples from home, education, work or other activities | How will differences between settings be considered? |
| Everyday effect | Missed steps, interrupted activities or help required | Which difficulties need support now? |
| Existing support | Reminders, routines, adjustments or assistance already used | How does this affect what observers see? |
| Other concerns | Relevant health, sleep, learning or emotional changes | What else should be assessed? |
Ask the clinic which records it wants before assembling a large archive. Useful material may include previous assessment summaries, relevant school or work information and a medication list if requested. Share documents through the service’s appropriate route rather than sending sensitive records widely.
Ask how history and settings are considered
The CPS diagnostic guidance describes a comprehensive medical assessment and information from multiple sources, with attention to functioning in different settings. It also emphasises considering other explanations and coexisting concerns.
Different accounts are useful information, not automatically evidence that someone is unreliable. A structured classroom, a familiar home routine and an unfamiliar appointment can place different demands on a person. Ask how the assessor will understand those differences and the assistance already making an activity possible.
If historical records or an informant are unavailable, tell the service early. Ask what alternatives it can consider and what limits that may place on the assessment. Do not invent a childhood history or ask another person to confirm events they do not remember.
Clarify the role of questionnaires and tests
NICE’s ADHD guideline states that diagnosis should not rely solely on rating scales or observational information. It describes a fuller clinical, developmental and psychosocial assessment by an appropriately qualified professional. This is UK guidance, not a statement about who may diagnose in every Canadian jurisdiction.
Ask which tools will be used, what they contribute and how the clinician interprets them alongside the history. If a question is hard to answer, note why and follow the assessor’s instructions. A questionnaire can organise information without replacing the clinical discussion.
Do not stop prescribed medication or change an established routine to make symptoms more visible unless the responsible clinician gives specific instructions. Tell the assessor what the usual arrangement is and ask how to prepare appropriately for the appointment.
Choose a focused set of appointment questions
- Explain: describe the concern, its history and the effect on meaningful activities.
- Clarify: ask how overlapping features, other conditions and assessment tools are considered.
- Plan: record the conclusion, any uncertainty and who will help with the next step.
Questions you may want to prioritise include: What information is still missing? How are the existing autism diagnosis and current concerns being considered together? What would support an ADHD diagnosis, and what might point elsewhere? What support can be discussed regardless of the final diagnostic outcome?
In a fictional example, a university student already diagnosed as autistic asks about persistent difficulties managing assignments across several courses and at home. They bring examples and describe existing reminders. The aim is to investigate the pattern and useful support, rather than demand a label based on one missed deadline.
Plan access and follow-up
Ask about communication and sensory arrangements before the appointment. Written questions, processing time, breaks or a chosen supporter may help the person participate. The clinician still needs to hear the person’s perspective through their preferred communication methods where possible.
At the end, ask for an explanation of the findings and whether any questions remain unresolved. Clarify which recommendations are immediate practical suggestions, which require another referral and which depend on a further discussion. A recommendation is not the same as a confirmed appointment or programme approval.
If treatment is proposed, arrange a separate, understandable conversation about its purpose, options, possible unwanted effects and review. This guide does not make a treatment choice. Keep the responsible clinician informed about other care so that plans can be considered together.
Common questions
Can a person be both autistic and have ADHD?
Yes. The CPS guidance recognises that the conditions can coexist. Whether both apply to a particular person requires appropriate assessment. An existing diagnosis should be part of the history rather than used as an automatic answer to every new concern.
Does difficulty concentrating prove ADHD?
No single difficulty establishes the diagnosis. Describe the pattern, history, settings and everyday effect to a qualified professional. Ask what other explanations should be considered and what information would help clarify the concern.
Should I bring an online screening result?
You can ask the clinic whether it would be useful. Keep the tool’s name, version, source and date with the result. Explain why you completed it, and do not treat a score as a substitute for the wider assessment.
What if teachers and family members disagree?
Bring concrete examples from both settings and describe any routines or support involved. Ask how the assessor will interpret the differences. The goal is to understand the pattern, not to decide that one person’s account must be discarded.
Can an adult be assessed without childhood school reports?
Ask the service what evidence it can consider when records are unavailable. Explain what you do and do not know. Assessment requirements and the effect of missing information should be clarified with the clinician rather than guessed from another person’s experience.
Should I change medication before the appointment?
Do not change prescribed treatment based on this guide. Ask the responsible clinician or assessment service how to prepare and provide an accurate account of current treatment. Different appointments may have different instructions that require individual advice.
Will a second diagnosis automatically change support?
Ask the particular service, school or workplace what information it needs and how decisions are made. Diagnosis, a description of needs and eligibility are different matters. Discuss practical barriers rather than assuming a label alone arranges assistance.
What if the assessment does not result in ADHD diagnosis?
Ask how the clinician explains the concerns and what further assessment or support may be appropriate. Clarify any uncertainty and follow-up options. An unresolved practical difficulty still deserves discussion even when one proposed explanation is not confirmed.
How can a supporter help during the appointment?
Agree their role with the person beforehand. They might help organise records, take notes or provide observations, while making clear which information is their own account. Preserve the person’s opportunity to communicate preferences and questions.
What should I write down before leaving?
Record the conclusion in language you understand, remaining questions, recommended next actions and the contact responsible for each. Ask when and how findings will be provided in writing. Keep any treatment questions for an appropriate discussion with the responsible professional.
Sources
Opened and checked on 22 October 2026. Appointment prompts are original editorial suggestions. This guide does not diagnose either condition or recommend treatment.
- Canadian Paediatric Society: ADHD, Part 3 — coexisting autism and ADHD; 2018 statement reaffirmed January 2024.
- Canadian Paediatric Society: ADHD, Part 1 — paediatric diagnostic assessment and coexisting concerns.
- NICE NG87: Recommendations — UK ADHD assessment guidance, particularly section 1.3.
