Autism Spectrum Disorder (ASD) is a neurodevelopmental disorder characterized by ongoing challenges with social communication and interaction, as well as restricted, repetitive patterns of behavior. Diagnosing ASD involves a comprehensive evaluation based on specific diagnostic criteria. Let’s take a deeper look at the diagnostic criteria and assessment methods for ASD.
Diagnosis
As per the Diagnostic and Statistical Manual of Mental Health Disorders – Fifth Edition (DSM-5), in order to be diagnosed with ASD, an individual must experience difficulties in the following two areas.
- Persistent deficits in each of the following three areas of social communication and interaction
- Deficits in social-emotional reciprocity: Examples include abnormal social approach, failure of normal back-and-forth conversation, reduced sharing of interests or emotions, and a lack of initiation or response to social interactions.
- Deficits in nonverbal communicative behaviors: This can include difficulties with integrating verbal and nonverbal communication, unusual or odd eye contact and body language, deficits in understanding and using gestures, and a lack of facial expressions and nonverbal communication.
- Deficits in developing, maintaining, and understanding relationships: This area involves challenges with adjusting behavior based on the social context, difficulties with sharing, imaginative play, or making friends, and a general absence of interest in peers.
- Two (or more) of the following four types of restricted, repetitive behaviors
- Stereotyped or repetitive motor movements, use of objects, or speech: These may include motor stereotypes, lining up toys, repeating words or phrases, and using idiosyncratic phrases in speech.
- Insistence on sameness, inflexible adherence to routines, or ritualized patterns of behavior: Some examples are significant distress at small changes, difficulties with transitions, rigid thinking patterns, specific greeting rituals, and the need for sameness in daily routines.
- Highly restricted, fixated interests that are abnormal in intensity or focus: This can involve a strong attachment to unusual objects, preoccupation with specific topics, or excessively limited and/or repetitive interests.
- Hyper- or hypo-reactivity to sensory input or unusual interest in sensory aspects of the environment: This can manifest as indifference to pain or temperature, intense reactions to sensory experiences, excessive smelling or touching of objects, or visual fascination with lights or movement.
- Clinical Observation/Interviews
- Third-Party Input (parents/caregivers, teachers, community supports, etc.)
- Review of Records (e.g., medical, academic, etc.)
- Standardised Tests
- Autism Diagnostic Observation Schedule – Second Edition (ADOS-2): Evaluates social interaction, communication, play, and imaginative use of materials in individuals suspected of having ASD.
- Childhood Autism Rating Scale (CARS) – An assessment of ASD traits in children over 2 years.
- Social Responsiveness Scale – Second Edition (SRS-2): reports on an individual’s social awareness and motivation, communication skills, repetitive behaviours, and restricted interests.
- Miscellaneous screening tools – Examples include but are not limited to the Autism Spectrum Rating Scales (ASRS), Camouflaging Autistic Traits Questionnaire (CAT-Q), Modified Checklist for Autism in Toddlers (MCHAT)
- Behavior and communication therapies
- Educational therapies
- Parent/Family Training
- Additional Interventions such as speech therapy, occupational therapy, and physical therapy may be beneficial to address communication, activities of daily living, and movement-related challenges.
- Medication
