Adult ADHD Diagnosis: A Step-by-Step UK Guide

Signs You Might Have ADHD as an Adult

Adult ADHD often looks very different from the stereotype of a hyperactive child. If several of the following have been persistent patterns throughout your life (not just recent stress), it is worth pursuing assessment:

• Chronic difficulty focusing on tasks that are not intrinsically interesting to you.
• Starting many projects but struggling to finish them.
• Losing things constantly — keys, phone, wallet, important documents.
• Running late despite genuinely trying to be on time.
• Difficulty following conversations or reading long texts without mind-wandering.
• Impulsive decisions — spending, speaking without thinking, sudden life changes.
• Emotional intensity — overreacting to small frustrations, rejection sensitivity.
• A sense of underachievement — feeling capable but unable to consistently perform.
• Reliance on urgency and deadlines to function (last-minute productivity).
• Exhaustion from the effort required to do things others seem to manage easily.

Self-Screening

Before seeing your GP, complete a self-screening questionnaire. The most widely used is:

• ASRS-v1.1 (Adult ADHD Self-Report Scale): 18 questions; freely available online. A score above the screening threshold does not diagnose ADHD but indicates it is worth pursuing further assessment.
• DIVA-5 preview: Some versions of the DIVA (Diagnostic Interview for ADHD in Adults) are available online as self-assessment tools.

The GP Appointment

1. 1

   Book a focused appointment

   Request a "double appointment" if available. Tell the receptionist it is for a mental health concern. This gives you 20 minutes instead of 10.

2. 2

   Come prepared

   Bring your completed ASRS, a list of specific symptoms and how they affect your life (work, relationships, finances, mental health), and any relevant school reports if available.

3. 3

   Be direct

   Say: "I believe I may have ADHD and I would like a referral for specialist assessment." Do not lead with anxiety or depression symptoms — these may be consequences of ADHD, but GPs often focus on them instead.

4. 4

   Request Right to Choose

   Ask: "I would like to exercise my NHS Right to Choose and be referred to [provider name]." Have your chosen provider researched in advance.

5. 5

   Handle pushback

   If your GP is dismissive, stay calm and ask them to record in your notes that you requested an ADHD referral and their clinical reason for declining. This creates an accountability trail.

Assessment Day: What to Expect

An ADHD assessment typically takes 1–3 hours and is conducted by a psychiatrist, clinical psychologist, or specialist nurse. Here is what usually happens:

• Structured diagnostic interview using DIVA-5, ACE+, or similar validated tool.
• Detailed discussion of your childhood and current symptoms across multiple life domains.
• Review of your developmental history — school reports, childhood behaviour, family input.
• Mental health history and screening for co-existing conditions (anxiety, depression, ASD).
• Some providers use computerised attention tests (e.g. QbCheck) as supplementary evidence.
• You may be asked to bring an informant — a parent, partner, or close friend who has known you a long time.

After Your Diagnosis

Receiving an ADHD diagnosis as an adult can be a profound experience — a mix of relief, grief, and validation. Here is what happens next in practical terms:

• Your specialist writes a diagnostic report and a letter to your GP recommending treatment.
• If medication is recommended, you enter the titration process — gradually finding your optimal dose.
• Your specialist requests a shared care agreement with your GP for ongoing prescribing.
• You may be eligible for workplace reasonable adjustments under the Equality Act 2010.
• You can apply for Access to Work funding for coaching, assistive technology, or workplace support.
• Consider whether additional assessment for co-existing conditions (such as Autism) would be helpful.

Frequently Asked Questions