What an ADHD Assessment Involves

A formal ADHD assessment is a structured clinical evaluation by a specialist, not a questionnaire. It explores your current symptoms, your history since childhood, the impact on your daily life, and rules out other explanations, in line with NICE guideline NG87.

It's a clinical assessment, not a test

A diagnosis of ADHD in adults is a clinical judgement made by a qualified specialist. NICE guideline NG87 is clear that it cannot be based on screening tools or rating scales alone; those only help decide whether an assessment is warranted.

Source: NICE NG87 (ADHD diagnosis and management).

What the assessment looks at

A thorough assessment explores four things: your current symptoms of inattention and/or hyperactivity-impulsivity; evidence that these were present in childhood, since ADHD is a neurodevelopmental condition that begins early; the impact on your functioning across different settings such as work, study, relationships and daily organisation; and the careful exclusion of other conditions that can mimic ADHD, such as anxiety, mood or sleep disorders.

Sources: NICE NG87 (comprehensive assessment of personal, educational, occupational and social functioning, and coexisting conditions); ADHD Clinical Academy summary of NG87.

Why childhood history matters

Because ADHD begins in childhood, the assessment explores your early experiences, at school and at home. Where they are available, things like school reports or accounts from family can add useful detail, though they are not essential if a clear developmental history can be gathered.

Source: NICE NG87; ADHD Clinical Academy (collateral history strengthens but absence does not preclude diagnosis).

Quality and safeguards: who can diagnose, and how

A good-quality ADHD assessment does more than follow a checklist; it sits within a recognised quality framework. NICE sets out what must be assessed, but it does not specify the detailed competencies of the assessor or the safeguards around the diagnosis. The UK Adult ADHD Network (UKAAN) addresses this gap with its Adult ADHD Assessment Quality Assurance Standard, which defines what a good-quality diagnostic assessment and report should contain and the competencies required to be a specialist assessor.

Source: Adamou et al. 2024, Adult ADHD Assessment Quality Assurance Standard, UKAAN (PMID 39156609).

A central safeguard in these standards is that clinicians who are not independently qualified to diagnose ADHD should work within a framework of multidisciplinary team (MDT) support and appropriate case supervision. This is precisely the safeguard that lower-quality, high-volume providers often skip, and its absence is a common reason assessments are later questioned or not accepted by other services. ThinkBetter matches patients only with CQC-registered clinics that operate within these quality standards, including MDT support and appropriate clinical supervision.

Source: Adamou et al. 2024 (PMID 39156609); poor-quality assessments risk non-acceptance by other clinicians and wasteful re-assessment.

Who can diagnose

ADHD in adults should only be diagnosed by a specialist with expertise in ADHD, typically a specialist psychiatrist or an appropriately qualified clinical professional working within the safeguards above. The clinics ThinkBetter connects you with are CQC-registered and staffed by such specialists.

Source: NICE NG87 (diagnosis by specialist with training and expertise in ADHD).