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AuDHD is not the sum of an autism diagnosis and an ADHD diagnosis. The two neurotypes interact. Each can mask the other. Each can shape what the other looks like. Some traits that appear to come from one are actually shaped by the other, and some traits that look like neither are produced by the combination.
A combined assessment reads them together. It uses the same gold-standard tools as the separate autism and ADHD assessments — MIGDAS-2, CAT-Q, SRS-2, WHODAS — but it gives the diagnostic question more time, because the differential between autism alone, ADHD alone, and AuDHD takes more time to read accurately. The assessment runs across two extended sessions for that reason.
The work is to reach the most accurate reading, not to confirm an already-held hypothesis. Where one neurotype is present without the other, that is the conclusion. Where both are present, the report describes how they interact specifically in this person.
This service is for adults whose picture has features of both autism and ADHD and where a single-condition assessment has not been able to do the picture justice. It is particularly relevant after a partial diagnosis where the picture has continued to feel incomplete, after years of treatment for one condition that has not landed, or where comprehensive documentation is needed for NDIS or workplace support across both neurotypes.
Comprehensive digital questionnaires covering developmental history, executive function, sensory processing, social communication, masking patterns, and the specific places where attention regulation and social processing have interacted over time.
The first session works through developmental history and current functioning, focusing on the points where attention and social communication intersect — where hyperfocus on a special interest looks different from focused interest, where social fatigue looks different from sensory fatigue, where executive function challenges look different in the two neurotypes.
The psychologist reviews the first session against the questionnaire data, identifying the specific interaction patterns to look at more carefully in the second session. The differential — autism alone, ADHD alone, both — is held open until the data supports a conclusion.
The MIGDAS-2 is used in the second session for deeper exploration. With more time, the assessment can hold both diagnostic questions side-by-side rather than working through them sequentially.
The clinical report explains the diagnostic reasoning across both neurotypes, including how they interact in this person. Where one is present without the other, that is named. Where both are present, the report covers the specific interaction pattern — what to attend to, what is likely to need accommodation, where the two neurotypes amplify each other and where they compensate.
An extended feedback session for a complex result. The aim is that the person leaves with a clear reading of how both neurotypes are working in their picture, well enough to act on it — for accommodation, for medication discussions, for the rest of the pathway.
When the assessment is the right step, the outcome is a clearer reading of how autism and ADHD are sitting together in this person — and either a combined diagnostic conclusion, a single-neurotype conclusion, or a clear note that the picture is something else. Each is a real outcome.
Where AuDHD is the conclusion, the report is documentation that addresses both neurotypes together rather than asking the person to translate one assessment into another. Accommodations, medication considerations, and ongoing support can be built around a single reading of the combined picture. Where the conclusion is a single neurotype, the assessment has at least answered the question that had been left open.
The assessment is not the treatment. The combined reading is the basis for what comes next inside the biio. pathway.