The problem with the private ADHD assessment market
The private ADHD assessment market in the UK has expanded considerably over the past five years, driven by growing public awareness of ADHD in adults and NHS waiting lists that now stretch to three to five years in most of England. That expansion has been broadly positive: more people have access to assessment faster than they would have through the NHS alone.
It has also created a market in which services that describe themselves using similar language, and that produce documents that look similar, are delivering substantially different clinical products. The consumer has little way of knowing this from the outside, because the language used in marketing is not standardised and the regulatory environment for diagnosis-only services is light.
This matters because the consequences of a low-quality assessment are not just abstract. They are practical: a GP who declines to act on the report, an employer who does not recognise the documentation, and a patient who has paid for an assessment and finds themselves no better positioned than before they started.
What clinician grade actually means
In UK healthcare, the title of consultant psychiatrist represents the highest grade of medical specialist in the psychiatric system. Reaching consultant level typically requires five to six years of medical school, two foundation years, six or more years of core and specialty psychiatry training, fellowship of the Royal College of Psychiatrists, and a competitive appointment process. It represents around fifteen years of postgraduate development beyond undergraduate medicine.
A mental health nurse assessing for ADHD is not less conscientious than a consultant psychiatrist. But they are working within a narrower clinical frame. They have extensive training in nursing care and in ADHD symptom recognition, but they have not had the breadth of psychiatric training that allows a consultant to reliably distinguish ADHD from the considerable range of other conditions that can produce similar presentations: anxiety, depression, bipolar disorder, autism spectrum conditions, personality difficulties, or combinations of these.
For a patient who presents with a relatively straightforward ADHD picture, this distinction may not matter. For a patient whose presentation is more complex, or whose ADHD is entangled with other conditions that also need to be addressed, the assessment by a less senior clinician may produce a diagnosis that is technically accurate but clinically incomplete.
"An assessment is only as useful as what it produces. The relevant measure is not whether a diagnosis was reached but whether that diagnosis holds up in the contexts that matter."
GP acceptance and shared care prescribing
The practical downstream consequence of clinician grade is GP acceptance. Many GPs are willing to act on a report from a GMC-registered consultant psychiatrist in the same way they would act on any specialist referral letter. They may have more reservations about a report from a mental health nurse, particularly where the service producing it is one that has received negative media coverage or that they have encountered problems with before.
This is not universal: some GPs decline to engage with private diagnoses regardless of who produced them, and some are willing to accept any report from a regulated professional. But the pattern is consistent enough that it represents a real risk for people who choose a lower-quality service primarily on cost grounds.
For people seeking shared care prescribing, the stakes are higher. A GP initiating NHS prescribing for a controlled drug needs to be confident in the clinical basis of the diagnosis. A report from a consultant psychiatrist provides that confidence in a way that a nurse-led assessment may not, and some GPs have adopted informal policies of not entering shared care on the basis of non-consultant reports.
Clinical accuracy and missed conditions
A less discussed but clinically important consequence of lower-quality assessments is the risk of missed conditions. ADHD in adults is frequently accompanied by anxiety, depression, or both. In some presentations, what appears to be ADHD is better understood as another condition, or as a combination of conditions that requires a more nuanced clinical response than ADHD treatment alone.
A consultant psychiatrist conducting a thorough assessment is well-placed to identify where the clinical picture is more complex and to say so clearly in the report. A nurse-led assessment following a structured checklist is less likely to identify these complexities, not because the clinician is not skilled within their scope but because the scope itself is narrower.
The consequence for the patient is that they may receive a confirmed ADHD diagnosis and begin treatment for ADHD, while the anxiety or depression that is driving a significant portion of their difficulties remains unaddressed. Treatment without accurate diagnosis is at best partially effective and at worst delays appropriate care.
What a failed assessment actually costs
Consider a scenario that plays out regularly: a person pays £250 for an assessment from a budget online service. They receive a diagnosis. Their GP declines to act on it, citing concerns about the quality of the report. They spend several months trying to resolve this, unsuccessfully. They eventually book a second assessment with a consultant psychiatrist, which costs £800. Total cost: £1,050, and several months of delay.
That £1,050 is more than the cost of going directly to a quality provider. The difference between a £250 assessment and an £800 one is £550. The failed assessment cost the person £250 in direct fees and an additional £800, totalling £1,050 rather than £800, plus months of additional waiting and frustration.
This scenario is not hypothetical. It is a pattern that is documented in patient forums, media reporting on the private ADHD assessment market, and in clinical practice. It does not happen in every case, but it happens often enough that the financial argument for a budget assessment is weaker than it appears.
Distinct assessments are conducted by GMC-registered consultant psychiatrists.
£799 all inclusive. Full report within 7 days.
Questions to ask any provider before booking
Before booking with any private ADHD assessment service, there are five questions worth asking directly. Who will conduct my assessment, and what is their professional registration and grade? Is the consultant psychiatrist conducting the assessment or only reviewing the report afterwards? What diagnostic interview and tools are used, and do they follow DSM-5 criteria? What is included in the quoted price, and is a written report and GP letter part of that? What happens if my GP does not accept the diagnosis?
A provider that cannot or will not answer these questions directly is worth approaching with caution. A provider that answers them clearly, and whose answers are consistent with a high-quality clinical service, is likely to be a better choice regardless of price.
This article discusses quality variation in the private ADHD assessment market based on publicly available information and clinical practice. It does not name specific providers. If you have concerns about an assessment you have already received, your GP or a second specialist opinion is the appropriate route.