Dr Neelam Zia, Consultant Psychologist - IntrospeXion:

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As common ADHD terminology, screening and diagnosis are often used interchangeably without much second thought. However, in reality, they actually refer to two different processes.  

When we confuse the two or use them in the wrong context, we risk creating false expectations about outcomes, support, and the subsequent steps and actions that individuals going through the process must take.

ADHD screening typically involves brief, validated questionnaires and structured conversations designed to detect whether an individual displays signs consistent with ADHD. These tools assist in identifying patterns in attention, organisation, impulsivity, restlessness, or emotional regulation. However, screening tools are only indicative, not definitive; they cannot confirm or exclude an ADHD diagnosis on their own (NICE, 2018).  

By contrast, the ADHD diagnosis process is a comprehensive clinical procedure. It requires a systematic evaluation against DSM-5 criteria, including evidence of symptom persistence, childhood onset, presence across multiple settings, and clear functional impairment. A full diagnostic assessment also involves careful differential diagnosis, considering alternative or co-occurring explanations such as anxiety, depression, trauma, sleep disorders, or substance use. Diagnosis relies on clinical judgment, developmental history, and corroborative information. It cannot be made solely on screening questionnaires (APA, 2022; NICE, 2018; UKAAN).  

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Why ADHD Screenings Are Still Valuable

Although screening is not diagnostic, it plays an important and evidence-based role in ADHD care pathways.  

Screenings can help individuals recognise long-standing patterns, offer language for difficulties that may have been poorly understood, and support timely and appropriate referral for further assessment. They can also enable more focused conversations with GPs, employers, educators, or clinicians, and help determine whether a full diagnostic assessment is likely to be beneficial.  

With traditional routes via healthcare systems experiencing excessively long waiting lists (sometimes for years), screenings can provide an invaluable first step for many. In the UK, thousands of people occupy waiting lists seeking clarity and actionable advice; screenings support understanding, validation, and help individuals make informed decisions while awaiting specialist input.  

When used appropriately, screening improves access and clarity without replacing the need for comprehensive diagnosis (NICE, 2018; Kooij et al., 2019).

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‍References

1. American Psychiatric Association. DSM-5-TR: Diagnostic and Statistical Manual of Mental Disorders (2022)

2. NICE. Attention deficit hyperactivity disorder: diagnosis and management (NG87) (2018)

3. UKAAN. Adult ADHD Assessment Quality Assurance Standards

4. Kooij et al. (2019). European consensus statement on diagnosis and treatment of adult ADHD. European Psychiatry

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