Background

Autism spectrum disorder (ASD) is a behaviourally diagnosed condition. It is defined by impairments in social communication or the presence of restricted or repetitive behaviours, or both. Diagnosis is made according to existing classification systems. In recent years, especially following publication of the Diagnostic and Statistical Manual of Mental Disorders‐Fifth Edition (DSM‐5; APA 2013), children are given the diagnosis of ASD, rather than subclassifications of the spectrum such as autistic disorder, Asperger syndrome, or pervasive developmental disorder‐not otherwise specified. Tests to diagnose ASD have been developed using parent or carer interview, child observation, or a combination of both.

Objectives

Primary objectives

1. To identify which diagnostic tools, including updated versions, most accurately diagnose ASD in preschool children when compared with multi‐disciplinary team clinical judgement.