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The diagnosis of autism is based on a person's reported and directly observed behavior.[1] There are no known biomarkers for autism spectrum conditions that allow for a conclusive diagnosis.[2]
In most cases, diagnostic criteria codified in the World Health Organization's International Classification of Diseases (ICD) or the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM) are used. These reference manuals are regularly updated based on advances in research, systematic evaluation of clinical experience, and healthcare considerations. Currently, the DSM-5 published in 2013 and the ICD-10 that came into effect in 1994 are used, with the latter in the process of being replaced by the ICD-11 that came into effect in 2022 and is now implemented by healthcare systems across the world. Which autism spectrum diagnoses can be made and which criteria are used depends on the local healthcare system's regulations.
According to the DSM-5-TR (2022), in order to receive a diagnosis of autism spectrum disorder, one must present with "persistent deficits in social communication and social interaction" and "restricted, repetitive patterns of behavior, interests, or activities."[3] These behaviors must begin in early childhood and affect one's ability to perform everyday tasks. Furthermore, the symptoms must not be fully explainable by intellectual developmental disorder or global developmental delay.
^Baird G, Cass H, Slonims V (August 2003). "Diagnosis of autism". BMJ. 327 (7413): 488–493. doi:10.1136/bmj.327.7413.488. PMC 188387. PMID 12946972.
^Lord, Catherine; Charman, Tony; Havdahl, Alexandra; Carbone, Paul; Anagnostou, Evdokia; Boyd, Brian; Carr, Themba; de Vries, Petrus J; Dissanayake, Cheryl; Divan, Gauri; Freitag, Christine M; Gotelli, Marina M; Kasari, Connie; Knapp, Martin; Mundy, Peter (2022). "The Lancet Commission on the future of care and clinical research in autism". The Lancet. 399 (10321): 271–334. doi:10.1016/S0140-6736(21)01541-5. hdl:11250/2975811. PMID 34883054. S2CID 244917920.
^"Section 2: Neurodevelopmental Disorders". Diagnostic and statistical manual of mental disorders : DSM-5-TR (Print) (Fifth edition, text revision. ed.). Washington, DC: American Psychiatric Association Publishing. 2022. ISBN 978-0-89042-575-6.
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