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Combined ADHD and Autism Assessment UK: When It Makes Sense

When a combined ADHD and autism assessment may be useful in the UK, how overlap is handled, what evidence is considered and what the from £1,750 pathway includes.

Written and reviewed by Focused Care PsychologyReviewed 2 September 2026Evidence based UK guide
Psychologist and client in a private assessment consultation
Direct answerA combined assessment can make sense when both ADHD and autism are genuine clinical questions and the person’s experiences cannot be understood reliably by assessing only one in isolation. It should still test each diagnostic question separately rather than assume one diagnosis implies the other.

Why ADHD and autism can overlap

Executive function difficulties, overwhelm, social fatigue, intense interests, sensory needs and emotional dysregulation can occur in different ways across ADHD, autism and other conditions. Similar outward experiences may have different underlying patterns.

When combined assessment may be efficient

A combined pathway may reduce duplicated history taking when both questions are already well founded. It can also help clinicians interpret apparent contradictions, for example, novelty seeking alongside a strong need for predictability, within the person’s wider developmental history.

What evidence should still be separate

The ADHD question requires evidence about developmental onset, symptoms and impairment. The autism question requires evidence about social communication and restricted or repetitive patterns across development. A combined service should be able to explain how evidence supports each conclusion.

What happens if only one diagnosis is supported

A combined assessment does not predetermine two diagnoses. The outcome may support ADHD, autism, both, neither, or identify uncertainty that needs further work. Feedback should explain why.

Cost and pathway

The Focused Care Psychology UK combined ADHD and autism assessment fee is from £1,750. The exact appointment arrangement and evidence plan are agreed according to clinical need and suitability.

Common questions

Is a combined assessment better than two separate assessments?

Not always. It is useful when both questions are clinically relevant; otherwise a focused assessment may be more proportionate.

Does having ADHD make autism more likely?

ADHD and autism can co occur, but one diagnosis does not establish the other.

Can a combined assessment lead to medication?

Medication is a separate medical prescribing decision and is not guaranteed by a diagnostic report.

Related services and guides

FCP

Focused Care Psychology Editorial Team

Clinical information is reviewed against current UK guidance and the practice’s stated scope. This article is general education and does not replace personalised clinical, medical, legal, education or employment advice. Read the editorial and corrections policy.

Primary and public sources

Sources checked 2 September 2026. Guidance and public pathways can change.

To report a factual concern, email admin@focusedcarepsychology.org.

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Combined ADHD and autism assessmentFees
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Combined ADHD and autism assessmentCurrent UK fees