Preparing for an Adult ADHD or Autism Assessment

A good adult assessment runs better when you arrive prepared. This is not about rehearsing or trying to look more or less symptomatic; it is about making sure the clinician has the information they need to see the lifelong pattern clearly. This article walks through what to gather, what to bring, and what to expect on the day.

What you are preparing for

Adult ADHD and autism diagnoses both require evidence that the picture has been present from early development ^{[1, 2]}. The clinician is mapping a lifelong pattern, not just a current snapshot. Most of the preparation is about making that mapping easier.

The four areas worth preparing:

• Specific, concrete examples of current difficulties
• Specific, concrete examples of childhood difficulties
• Family history of neurodevelopmental and mental health conditions
• A reliable account of how you function across different settings

Gathering childhood evidence

This is the part many adults find most useful to do in advance, and most useful to bring to the appointment.

School reports

Old reports cards, particularly end-of-year teacher comments, are the most useful single piece of evidence. They were written contemporaneously, by people who were not thinking about ADHD or autism, and they often capture the pattern in plain language. Comments like "drifts off if not actively engaged", "very capable but inconsistent", "could do so much more if she applied herself" or "thrives on routine, finds change unsettling" are diagnostic gold dust.

If you do not have them, family members sometimes do. Schools can sometimes provide copies. Even a single year of reports is useful.

Parental or family memory

If a parent or older sibling is available and willing to take part, they can be enormously helpful. The clinician may want to interview them directly (the ADI-R for autism assessment specifically) or take their written notes as informant evidence.

Ask them to be honest rather than kind. The clinical picture needs the difficulties as well as the strengths.

Childhood photos and memories

Photos from childhood can be useful, particularly for autism assessment where stimming, posture, social positioning and play patterns sometimes appear visibly. Specific memories help too: the time you would not eat the school dinner because the textures touched, the time you read the whole encyclopaedia, the time you ran out of class because the lights buzzed.

Your own recollection

Where parents are not available or memory is partial, your own recollection is still useful. Write down what you remember about:

• Friendships at primary school and secondary school
• Specific subjects you loved and specific subjects you struggled with
• Your bedroom at twelve (organised, chaotic, sensory-driven, completely uninhabitable for ten-minute homework sessions)
• Patterns at home (sleep, eating, sensory needs, family conflicts)

Documenting current difficulties

For the current picture, a short list under each of the following headings is more useful than a generic statement:

• Work or career: specific examples of where the difficulty shows up
• Home and admin: post, bills, household tasks, organisation
• Relationships: patterns that recur across relationships, not just one
• Self-care: sleep, eating, exercise, health admin
• Money: spending patterns, savings, financial anxiety
• Driving, where relevant: focus, lateness, near-misses
• Sensory: environments you find draining, environments you seek out
• Mental health: anxiety, depression, periods of burnout

Three to five concrete examples under each heading is more useful than an essay. Patterns matter more than individual events.

Family history

Neurodevelopmental conditions and mental health difficulties run in families ^[3]. The clinician will ask about:

• ADHD and autism in parents, siblings, children
• Anxiety, depression, OCD, eating disorders in the family
• Bipolar disorder and schizophrenia in the family
• Substance use patterns
• Suicide, where relevant

If you do not know, that is fine. Saying "I do not know" is more useful than guessing.

Co-occurring and differential

Be ready to talk about:

• Past or current anxiety and depression, including any treatment and how you responded
• Sleep, including insomnia, poor sleep quality, or known sleep disorders
• Substance use, including alcohol, cannabis and any other use, however brief or historical
• Eating patterns and any history of eating difficulties
• Past trauma, where you are comfortable talking about it
• Physical health conditions, including thyroid disease and any chronic conditions
• Current medication

A NICE-aligned assessment looks at the whole picture ^{[1, 2]}. Honesty here is what makes the differential decision sound.

Practical preparation for the day

A few things worth doing in the week before:

• Read the paperwork the provider has sent; complete it honestly, in detail
• Sleep as well as you can the night before; clinical interviews are tiring
• Eat before the appointment; this is not a fasting context
• Bring water and a snack; an adult assessment runs two to three hours, sometimes split across sessions
• Bring your one-page summary, school reports, family input
• Tell the clinician up front if any topic is particularly difficult; they will pace accordingly
• Bring a trusted person if helpful, although they usually wait outside during the main interview

What not to do

• Do not rehearse symptoms. The clinician is not looking for a performance. Honest, specific answers are more diagnostic than smooth ones.
• Do not minimise. Many adults reflexively make their difficulties sound smaller. The clinician needs the full picture, including the things you usually hide.
• Do not exaggerate. A specific honest example beats a dramatic generalisation every time.
• Do not assume you have to know everything. "I do not know" and "I cannot remember" are valid answers.

What this means in practice

• Gather childhood evidence in advance. School reports and parental memory are the highest-value preparation.
• Document current difficulties as a list of specific examples across settings, not as an essay.
• Bring family history, including the difficult parts.
• Be honest about co-occurring conditions; the clinician needs them to see the whole picture.
• The assessment is a conversation, not a test. Prepare for clarity, not performance.

When to speak to a professional

If you have an assessment booked, follow your provider's specific instructions in addition to the general preparation above. NeuroFX offers private adult ADHD assessment and private adult autism assessment from our Bedford clinic. Seek same-day help via 111 (or 999 in an emergency) for any mental health crisis.

Sources

1. NICE. Attention deficit hyperactivity disorder: diagnosis and management. NG87. National Institute for Health and Care Excellence. https://www.nice.org.uk/guidance/ng87
2. NICE. Autism spectrum disorder in adults: diagnosis and management. CG142. National Institute for Health and Care Excellence. https://www.nice.org.uk/guidance/cg142
3. Kooij JJS, Bijlenga D, Salerno L, et al. Updated European Consensus Statement on diagnosis and treatment of adult ADHD. European Psychiatry. 2019;56:14-34.