Learn / The Whole Picture
Diagnostic pathways
One answer can be right and still incomplete
Missed, misidentified, incomplete, sequential, overshadowed. A later diagnosis does not automatically invalidate an earlier one.
Depression may have been real. ADHD may also have been present. Autism may later explain experiences neither diagnosis fully accounted for. The task is not to decide which label wins. The task is to improve the model of the whole person.
A later diagnosis does not automatically invalidate an earlier one.
- Missed — a relevant condition has not been identified.
- Misidentified — a presentation has principally been attributed to another explanation.
- Incomplete — an existing diagnosis may be valid while an important co-occurring condition remains unidentified.
- Sequential — different components are recognised at different points in life.
- Diagnostic overshadowing — characteristics are attributed automatically to an existing diagnosis, making another condition harder to recognise.
1 · Statement
Different parts of a person's profile are often recognised at different points in life. In children with both ADHD and autism, those whose ADHD was identified first have been observed to receive an autism diagnosis later. A later diagnosis does not automatically invalidate an earlier one.
2 · Classification
Associated. Observational US survey evidence plus clinical consensus on co-occurrence.
3 · Papers
4 · Claim limitation
Order of labels follows access as much as it follows biology. Not an Australian cohort.
Last reviewed
1 September 2026
1 · Statement
Diagnostic overshadowing is the tendency to attribute symptoms automatically to an existing diagnosis, making another condition harder to recognise. The original experimental literature concerned intellectual disability. The same mechanism is clinically relevant when ADHD, autism or a psychiatric label becomes a ceiling on curiosity.
2 · Classification
Associated. Named mechanism with experimental roots in intellectual disability; applied clinically to other first diagnoses.
3 · Papers
4 · Claim limitation
Direct experimental replication in adult ADHD/autism clinics is thinner than the original ID literature. The concept is used here as a documented failure mode, not as a score.
Last reviewed
1 September 2026
Diagnostic overshadowing was named in the intellectual-disability literature. The mechanism — a known label becoming a ceiling on curiosity — is relevant wherever a first diagnosis is treated as a complete model of the person. Extending the concept is a clinical application, not a new trial finding.
Sources used on this page
- Miodovnik A, Harstad E, Sideridis G, Huntington N (2015). Timing of the Diagnosis of Attention-Deficit/Hyperactivity Disorder and Autism Spectrum Disorder.
- Jopp DA, Keys CB (2001). Diagnostic overshadowing reviewed and reconsidered.
- Young S, et al. (2020). Guidance for identification and treatment of individuals with attention deficit/hyperactivity disorder and autism spectrum disorder based upon expert consensus.
- Faraone SV, Banaschewski T, Coghill D, et al. (2021). The World Federation of ADHD International Consensus Statement: 208 Evidence-based conclusions about the disorder.
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