Autism Diagnostic Observation Schedule
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| Autism Diagnostic Observation Schedule | |
|---|---|
| Name | Autism Diagnostic Observation Schedule |
| Purpose | Standardized assessment for autism spectrum disorder |
| Synonyms | ADOS |
Autism Diagnostic Observation Schedule. The Autism Diagnostic Observation Schedule is a standardized, semi-structured observational assessment tool used to evaluate social interaction, communication, play, and imaginative use of materials for individuals suspected of having an autism spectrum disorder. Developed by Catherine Lord, Michael Rutter, Pamela C. DiLavore, and Susan Risi, it is considered a gold-standard instrument in both clinical practice and research settings. The assessment involves a series of structured and semi-structured tasks that allow the examiner to observe behaviors directly associated with the diagnostic criteria for autism.
Overview
The instrument is designed to provide a standardized context in which to observe behaviors critical for the diagnosis of autism spectrum disorder. It is widely used in conjunction with other measures, such as the Autism Diagnostic Interview-Revised, to form a comprehensive diagnostic evaluation. The assessment is administered by a trained clinician and is appropriate for individuals across a wide range of ages, developmental levels, and language abilities. Its creation was a significant advancement in the field of developmental psychology, providing a more objective framework than earlier, less structured clinical observations.
Development and history
The initial development of the Autism Diagnostic Observation Schedule began in the late 1980s, with key work conducted at the University of Chicago and later at the University of Michigan. The principal developers, including Catherine Lord, sought to create an instrument that addressed limitations in existing diagnostic methods, which often relied heavily on parent report. The first edition was published in 1989, with subsequent revisions, including the ADOS-2 released in 2012, refining the algorithms and expanding its applicability. Its development was influenced by earlier diagnostic frameworks like those in the Diagnostic and Statistical Manual of Mental Disorders and the International Classification of Diseases.
Modules and administration
The assessment consists of five modules, each tailored to a specific developmental and language level, from nonverbal toddlers to verbally fluent adults. Module 1 is for children with minimal phrase speech, Module 2 for those using phrase speech but not verbally fluent, Module 3 for verbally fluent children and young adolescents, and Module 4 for verbally fluent older adolescents and adults. A Toddler Module was added to the ADOS-2 for children under 30 months. Administration involves presenting a series of planned social "presses" and activities, such as those involving a Tickle-Me-Elmo doll or a birthday party narrative, within a session lasting approximately 40 to 60 minutes.
Scoring and interpretation
Behaviors are coded immediately following the administration based on a detailed manual. Scores are given in domains such as Social Affect and Restricted and Repetitive Behaviors, which are then combined to create algorithm totals. These totals are compared to established cut-offs to classify individuals into categories of Autism Spectrum, Autism, or Non-Spectrum. The scoring system was significantly revised in the ADOS-2 to improve alignment with diagnostic criteria from the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition. Interpretation requires substantial training and is typically conducted by professionals like clinical psychologists or developmental pediatricians.
Psychometric properties
Extensive research has established strong psychometric properties for the instrument, including high inter-rater reliability and test-retest reliability. Studies published in journals like the Journal of Autism and Developmental Disorders and the Journal of Child Psychology and Psychiatry have demonstrated its good sensitivity and specificity in differentiating autism spectrum disorder from other developmental conditions like language delay or intellectual disability. The tool's validity has been supported through correlations with other diagnostic measures and its use in major research networks like the National Institutes of Health-funded Studies to Advance Autism Research and Treatment network.
Clinical use and applications
The Autism Diagnostic Observation Schedule is a cornerstone of diagnostic evaluations in clinics worldwide, including those at institutions like the Marcus Autism Center and the Yale Child Study Center. Its applications extend beyond initial diagnosis to include measuring treatment response in intervention studies and phenotyping participants in genetic research, such as that conducted by the Simons Foundation Autism Research Initiative. It is also used in educational settings to inform Individualized Education Program planning and by agencies like the Centers for Disease Control and Prevention in surveillance efforts for autism spectrum disorder prevalence.