Our approach to assessment

Why assessment quality matters

If you are considering a private neurodevelopmental assessment, you have probably already done a lot of reading. You may have taken an online screening questionnaire, watched a video that made you think “that is exactly me,” or spoken to someone who was recently diagnosed and recognised yourself in their story. By the time most people get in touch with us, they already have a strong sense that something is going on. What they want is clarity, and they want to trust the answer.

That trust depends on the quality of the assessment itself. A confident diagnosis requires more than a screening questionnaire and a short conversation. It requires a systematic process that gathers evidence from multiple sources, considers what else could explain your difficulties, and arrives at a conclusion that can be clearly justified in a written report. This page explains what that process involves and why each part matters.

Through our clinical work, we regularly review diagnostic reports produced by other services. Many are competent, but a significant proportion rely heavily on pre-populated templates: standard paragraphs describing what ADHD or autism is, blocks of text that appear identically across different patients, and formulations that could apply to almost anyone who screened positive. This is not our approach. Every assessment at Caledonian Psychiatry is built around the individual. The questions asked, the areas explored in depth, and the way the clinical picture is formulated are shaped by what emerges during your consultation, not by a proforma.

Your diagnostic report is not just a clinical record. It is the document your GP will use when deciding whether to enter into a shared care arrangement. It is the document an employer or university will read when considering reasonable adjustments. It may support an application for Access to Work funding, Disabled Students’ Allowance, or Personal Independence Payment. A thorough, clearly reasoned report removes any clinical basis for refusal and gives your GP the confidence to say yes. A report that reads like a template does not do this.

Structured assessment with validated tools

Every assessment combines a detailed clinical interview with validated screening and diagnostic instruments, selected for the individual and the clinical question being asked. These tools provide an objective, evidence-based framework alongside the clinical conversation, ensuring that nothing important is missed and that the conclusions in your report are supported by recognised measures.

For ADHD, depending on the presentation, tools used may include the ASRS (Adult ADHD Self-Report Scale), Barkley Functional Impairment Scale, and DIVA-5 (Diagnostic Interview for ADHD in Adults). Every autism assessment includes a full suite of validated instruments: the AQ-50 (Autism Spectrum Quotient), EQ-40 (Empathy Quotient), RAADS-R (Ritvo Autism Asperger Diagnostic Scale – Revised), CAT-Q (Camouflaging Autistic Traits Questionnaire), and RMET (Reading the Mind in the Eyes Test). The CAT-Q measures camouflaging directly, which makes it particularly informative for women, who are more likely to mask autistic traits and to be underestimated by traditional scales. Beyond these, additional instruments are chosen based on what will be most helpful in building a clear and defensible diagnostic picture for you.

Developmental history

ADHD and autism are neurodevelopmental conditions. Both ICD-11 and NICE guidance require evidence that the core features were present during the developmental period, even when they were not recognised until adulthood. This is why every assessment includes a detailed exploration of your developmental history, covering childhood behaviour, early friendships, school experiences, family dynamics, and communication milestones.

For many adults, this is the first time anyone has asked these questions in a structured way. The goal is not to find a neat childhood story that proves the diagnosis. It is to understand the trajectory of your difficulties over time and to identify patterns that may have been missed, misinterpreted, or attributed to something else entirely.

Collateral evidence

Self-report is essential, but it is not always sufficient on its own. Memory is imperfect, and many people find it difficult to recall specific details from early childhood. A collateral history, information from someone who knew you as a child, can help fill in those gaps and provide a second perspective on your early development.

Where possible, we will ask whether a parent, sibling, or other family member would be willing to contribute. The collateral history is not a test of your credibility. It is simply an additional source of evidence that can strengthen the clinical picture.

Not everyone has a family member who is able or willing to help. Some people are estranged from their families, some have parents who are no longer alive, and some have family members who do not accept there could be anything different about their child, even now. If this is your situation, you are not alone, and it does not count against you. Other sources of corroborating evidence become more important: school reports, previous clinical records, or educational psychology assessments. Many people are diagnosed confidently without any collateral history at all.

Functional impairment

A diagnosis of ADHD or autism is not made on symptoms alone. Both ICD-11 and NICE guidance are clear that the symptoms must cause clinically significant impairment in social, occupational, or other important areas of functioning. Two people can have identical symptoms but very different levels of impairment, depending on their circumstances, their coping strategies, and the demands placed on them.

Every assessment includes a structured evaluation of how your symptoms affect your daily life: your work or studies, your relationships, your ability to manage finances and household tasks, your physical health, and your emotional wellbeing. We use validated measures of functional impairment alongside the clinical interview, because these provide an objective benchmark that strengthens the diagnostic conclusion.

Functional impairment is also relevant when symptoms are present but the threshold for a formal diagnosis is not quite met. In these cases, the report will explain this clearly and offer practical recommendations, because understanding your difficulties does not depend on whether they cross a diagnostic line.

Differential diagnosis

Perhaps the most important part of any neurodevelopmental assessment is the question that is often overlooked: what else could this be? Anxiety, depression, bipolar disorder, complex trauma, personality difficulties, sleep disorders, and even thyroid dysfunction can all mimic or overlap with neurodevelopmental presentations. ICD-11 requires that the clinical picture is not better accounted for by another condition. Getting this wrong has real consequences.

Every assessment includes a systematic consideration of differential diagnoses. We do not simply confirm or rule out the condition you came in asking about. We consider the full range of possibilities, explain in the report why each relevant differential was considered, and set out the reasoning behind the conclusion. If a coexisting condition is identified alongside the primary diagnosis, or instead of it, this is explained clearly with recommendations for what to do next.

This is the part of the assessment that requires clinical experience and judgement. Screening tools cannot do it. Questionnaires cannot do it. It requires a clinician who is trained in general adult psychiatry as well as neurodevelopmental conditions, and who is willing to sit with complexity rather than reach for the most obvious answer.

Clinical standards

All assessments follow the relevant national and international clinical guidelines. ADHD assessments are conducted in accordance with NICE NG87, SIGN 145, and ICD-11 diagnostic criteria, and the service operates in line with the AQAS (ADHD Quality Assured Service) standard. Autism assessments follow NICE CG142 and ICD-11 criteria.

Following these frameworks is not about ticking boxes. It is about ensuring that the assessment is thorough enough to produce a conclusion that can be trusted, that your GP will accept, and that will stand up to scrutiny if it is ever questioned.

If you have questions about our assessment process, or if you would like to discuss whether an assessment is the right next step for you, please get in touch. You can also read a practical overview of private ADHD assessment in Scotland, or book an appointment online.