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This renders differential and accurate diagnosis of these conditions difficult, leading to diagnostic overshadowing and misdiagnosis. The purpose of this study was to explore professionals' perspectives on the differential diagnosis of autism, attachment disorders and CPTSD in young people; and of autism, CPTSD and EUPD in adults. A co\u2010produced three\u2010round Delphi study gathered information through a series of questionnaires from 106 international professionals with expertise in assessing and\/or diagnosing at least one of these conditions. To provide specialist guidance and data triangulation, working groups of experts by experience, clinicians and researchers were consulted. Delphi statements were considered to have reached consensus if at least 80% of participants were in agreement. Two hundred and seventy\u2010five Delphi statements reached consensus. Overlapping and differentiating features, methods of assessment, difficulties encountered during differential diagnosis and suggestions for improvements were identified. The findings highlight current practices for differential diagnosis of autism, attachment disorders, CPTSD and EUPD in young people and adults. Areas for future research, clinical and service provision implications, were also identified.<\/jats:p>","DOI":"10.1111\/bjop.12731","type":"journal-article","created":{"date-parts":[[2024,9,20]],"date-time":"2024-09-20T03:25:30Z","timestamp":1726802730000},"page":"1-33","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Differential diagnosis of autism, attachment disorders, complex post\u2010traumatic stress disorder and emotionally unstable personality disorder: A\u00a0Delphi study"],"prefix":"10.1111","volume":"116","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7818-3554","authenticated-orcid":false,"given":"Rachel","family":"Sarr","sequence":"first","affiliation":[{"name":"Institute of Psychiatry, Psychology and Neuroscience King's College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Debbie","family":"Spain","sequence":"additional","affiliation":[{"name":"Institute of Psychiatry, Psychology and Neuroscience King's College London  London UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alice M. 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