Your assessment is booked. Whether it's weeks or months away, now is the time to start preparing. The quality of an ADHD assessment depends heavily on the information you bring to it. Assessors can only work with what they're given, and a well-prepared appointment leads to a more accurate outcome. Here's a practical guide to getting ready.
Why Preparation Matters
An ADHD assessment is a structured clinical conversation that typically lasts 90 minutes to 3 hours. In that time, the assessor needs to build a complete picture of your symptoms, their history, and their impact on your life. If you walk in unprepared, you'll spend the assessment trying to recall specific examples on the spot, which is hard for anyone and especially hard if you have ADHD.
Preparation also helps you feel more in control of the process. Walking in with notes, documents, and a clear sense of what you want to communicate reduces the anxiety that can make assessments feel overwhelming.
The Pre-Assessment Questionnaires
Most providers send questionnaires before your appointment. Common ones include the ASRS (Adult ADHD Self-Report Scale), the DIVA (Diagnostic Interview for ADHD in Adults), and the Weiss Functional Impairment Rating Scale. Some providers also ask an informant (someone who knows you well) to complete a separate questionnaire.
Complete these honestly. Don't minimise your symptoms to seem 'normal,' but don't exaggerate either. Answer based on your typical experience, not your worst day. If a question doesn't apply, say so. Inconsistency between questionnaires and the clinical interview raises flags that can complicate the process.
What Documents to Gather
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School reports. These are the single most valuable piece of evidence for adult ADHD assessment. Comments like 'easily distracted,' 'could try harder,' 'doesn't apply himself,' 'bright but inconsistent,' or 'talks too much in class' are all relevant. If you don't have original reports, ask your parents or contact your old school. Some schools keep records for decades.
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Any previous psychological or psychiatric assessments. If you've ever been assessed for anxiety, depression, learning difficulties, or any other condition, bring the reports. They provide context and help the assessor understand your history.
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Employment records or performance reviews. If you have access to old performance reviews that reference issues with time management, organisation, meeting deadlines, or inconsistent performance, these demonstrate functional impairment in a workplace setting.
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Photo ID and proof of address. Most providers require these for identity verification, particularly for remote assessments where medication prescribing may follow.
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A written summary of your symptoms and their impact. This is the most important thing you can prepare yourself. We'll cover what to include in the next section.
How to Write Your Symptom Summary
The assessor will ask you about your symptoms, but having a written summary ensures you don't forget anything important. Structure it in three sections.
First, childhood symptoms (before age 12). Think about school, friendships, and home life. Were you always losing things? Constantly fidgeting? Unable to sit through lessons? Did you daydream? Struggle to finish homework despite understanding the material? Get into trouble for talking or acting impulsively? Were you the kid who started every project with enthusiasm but never finished anything?
Second, current symptoms. Map these against the three ADHD domains: inattention (difficulty sustaining focus, losing things, forgetting appointments, struggling with admin), hyperactivity (restlessness, inability to relax, talking excessively, needing to be constantly busy), and impulsivity (making snap decisions, interrupting others, spending impulsively, saying things you regret). Use specific examples rather than generalities.
Third, functional impact. How do your symptoms affect your work, relationships, finances, daily routines, and mental health? Be concrete: 'I've been put on a performance improvement plan twice because I miss deadlines' is more useful than 'work is hard sometimes.'
Create a free NDPathway account to access our evidence gathering checklist. It walks you through each section with prompts and examples, so you don't have to start from a blank page.
Preparing Your Informant
The assessor may want to speak to someone who knew you as a child (ideally a parent) or someone who knows you well now (a partner or close friend). Give your informant a heads-up about what they'll be asked. They don't need to prepare a speech, but it helps if they've thought about specific examples of your behaviour rather than speaking in generalities.
If no informant is available, the assessment can still proceed. Bring whatever alternative developmental evidence you can: school reports, childhood diaries, family anecdotes you can relay yourself.
On the Day
Bring everything. Your written summary, school reports, ID, and any other documents. If the assessment is remote, have documents ready to screen-share or upload. Eat beforehand and have water to hand. If you're anxious, that's entirely normal. Tell the assessor at the start; it's useful clinical context and they'll adjust their approach.
For a full walkthrough of the assessment itself, see our article on what happens in an ADHD assessment.
Sources
Psychiatry-UK: What to expect from an ADHD assessment · NHS: ADHD in adults · NICE Guideline NG87 · ADHD UK: Diagnosis pathways
Need help organising your evidence?
Our free evidence gathering checklist prompts you through childhood symptoms, current impact, and documents to collect. It's designed for ADHD brains, so it breaks the task into small, manageable steps.
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