Understanding the different types of adhd in adults is the first step for anyone considering an assessment. The public material that we can verify describes the condition, its sub‑types and the pathways to care, but it does not discuss how purchasers of assessment services compare methods or outcomes.
What the sources say about adult ADHD sub‑types
ADHD Test explains that three primary sub‑types exist in adults: inattentive, hyperactive‑impulsive and combined. The article gives the following breakdown:
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| Subtype | Share of cases |
|---|---|
| Inattentive (often called ADD) | 33 % |
| Hyperactive‑impulsive | 7 % |
| Combined (inattentive + hyperactive‑impulsive) | 60 % |
| Source: ADHD Test, "different types of ADHD in adults" (2026) | |
The NHS page confirms that most adults show a mix of inattentive and hyperactive‑impulsive symptoms, while a minority display only one type. It also notes that women are more likely to present with inattentive symptoms, which can be harder to recognise.
Royal College of Psychiatrists (RCPsych) adds that ADHD is a neurodevelopmental disorder that begins in childhood and often persists into adulthood, affecting learning, communication and emotional regulation.
How assessments are usually arranged
In the United Kingdom, the NHS recommends that a GP be the first point of contact. The GP will ask about symptoms, rule out other conditions such as autism or anxiety, and then refer the patient to a specialist psychiatrist for a formal assessment. The RCGP notes that GPs act as gate‑keepers and that most referrals go to secondary‑care specialists, although some patients seek private providers directly.
Canada’s public‑service hiring guide outlines a different but related process for workplace accommodations. It states that a qualified professional must produce a written report documenting the functional impact of ADHD before an employer can implement reasonable accommodations. The guide stresses that the person with ADHD should be the primary source of information about their limitations, but professional documentation is still required.
Both the UK and Canadian frameworks therefore involve a two‑step pathway: an initial clinical interview (often with a GP or primary‑care provider) followed by a specialist assessment that results in a formal diagnosis and, where relevant, a recommendation for accommodations.
The missing evidence on buyer comparisons
None of the six public sources – ADHD Test, NHS, RCPsych, the British Dietetic Association article, the RCGP framework and the Canada public‑service guide – mention how organisations or individuals choose between different assessment providers. They describe the condition, prevalence (RCGP cites 3‑4 % of UK adults) and the clinical pathway, but they do not provide data on:
- Whether buyers look at the assessment method (e.g., in‑person interview vs. online questionnaire).
- How results are compared across providers (e.g., diagnostic criteria, scoring algorithms).
- Any cost‑benefit analysis or quality‑of‑service metrics that might influence a purchase decision.
Because the claim that “buyers need to compare method and results, not just the brochure name” is not supported by any of the fetched material, we have to report the evidence gap. The research packet itself flags this as the reason for a recommended rejection.
What consumers can do now
Even without a formal buyer‑comparison framework, individuals can take a few practical steps when seeking an assessment:
- Check professional credentials. Both the NHS and Canada’s guide require a qualified professional – usually a psychiatrist or a psychologist with a relevant licence.
- Ask about the assessment process. Is it a single interview, a series of questionnaires, or a combination? Knowing the method helps gauge the depth of evaluation.
- Request information on outcome reporting. Some providers give a detailed written report, while others may only provide a diagnostic label. The level of detail can affect subsequent support, such as workplace accommodations.
- Consider cost and wait times. Private providers may offer faster appointments, but public routes (NHS, provincial health services) are typically free at the point of use.
These steps are derived from the procedural descriptions in the NHS, RCGP and Canada sources, not from any comparative buyer study.
What remains unknown
The public record does not tell us how many organisations actively procure assessment services, what criteria they use, or whether they evaluate outcomes beyond the diagnostic label. It also does not reveal whether buyers prefer certain brands because of marketing language on brochures. Until a dedicated study or industry survey is published, the buying problem remains an open question.
For readers who need an assessment, the safest approach is to follow the clinical pathways described by the NHS, RCPsych and Canadian guide, and to ask providers directly about their methods and reporting standards.
Internal links: Evening Standard Canada – Health | Evening Standard Canada – Mental Health
External sources: NHS – ADHD in adults, RCPsych – ADHD in adults, British Dietetic Association – adult ADHD, RCGP – ADHD framework, Canada – assessment accommodations for ADHD.