Autism spectrum conditions are associated with differences in social communication, behavior, cognitive style, sensory processing, and adaptation to change.
Contemporary approaches increasingly conceptualize autism not only as a diagnostic category, but also as a spectrum of traits that vary in degree across individuals, including within the general population. Assessment therefore includes both professional diagnostic methods and dimensional self-report instruments.
Self-report questionnaires do not establish a clinical diagnosis, but they can be useful for screening, research, self-reflection, and describing individual profiles of autistic traits.
Formal autism assessment relies on structured observation, developmental history, clinical judgment, and information from multiple sources. These methods usually require professional training.
The Autism Diagnostic Observation Schedule (ADOS-2) is a structured observational assessment used by trained professionals.
The Autism Diagnostic Interview (ADI-R) is a structured interview focused on developmental history and autism-related behaviors.
The Social Responsiveness Scale (SRS-2) is a rating scale assessing social impairment associated with autism across naturalistic settings.
The Childhood Autism Rating Scale (CARS) is a clinician-rated measure used to evaluate autism-related behaviors and symptom severity, especially in children. It requires observation and professional interpretation.
Adult screening instruments assess autistic traits dimensionally, including social communication, routines, restricted interests, attention to detail, and other autism-related patterns.
The Autism Spectrum Quotient (AQ, AQ-10, AQ-Child) is one of the most widely used self-report measures of autistic traits in adults. It assesses areas such as social skills, attention switching, attention to detail, communication, and imagination.
The Ritvo Autism Asperger Diagnostic Scale (RAADS-R) was developed as an adult screening instrument, especially for individuals whose autistic traits may not have been recognized in childhood.
The Comprehensive Autistic Trait Inventory (CATI) provides a modern multidimensional assessment of autistic traits in adults, including social interaction, communication, social camouflage, repetitive behaviors, cognitive rigidity, and sensory sensitivity.
The Adult Social Behavior Questionnaire (ASBQ) assesses autism-related social and behavioral characteristics in adults, including social interaction, communication, and restricted or repetitive patterns of behavior.
The Introspective Predictive Processing Inventory (IPPI) assesses subjective predictive-processing experiences in autistic and non-autistic adults, including prediction integration, interpretation, prediction-error sensitivity, and stability needs.
Popular online tools such as the Aspie Quiz are also widely known, but they are not based on the same level of established psychometric evidence and should be interpreted with caution.
Child and adolescent screening usually relies on parent-, caregiver-, or teacher-report instruments. These tools help identify developmental and behavioral signs that may require further professional evaluation.
The Autism Spectrum Screening Questionnaire (ASSQ) assesses autism-related traits in school-age children and adolescents, especially social communication and behavioral features.
The Childhood Autism Spectrum Test (CAST) is a parent-report screening tool for autism-related characteristics in children.
The Checklist for Autism Spectrum Disorder (CASD) is a 30-item checklist used to screen for autism-related symptoms in children and adolescents. It is primarily a professional or informant-based tool.
The Social Communication Questionnaire (SCQ) screens for autism-related social communication difficulties and restricted or repetitive behaviors.
The Modified Checklist for Autism in Toddlers (M-CHAT-R) assesses early autism-related behaviors, focusing on social communication, attention, play, and repetitive behavior.
This group covers milder or less obvious autism-related traits, as well as strategies used to mask, adapt, or consciously manage autistic features in social situations.
The Broad Autism Phenotype Questionnaire (BAPQ) assesses these traits, especially in non-clinical populations and relatives of autistic individuals. It includes dimensions such as Aloofness, Rigidity, and Pragmatic Language.
The Camouflaging Autistic Traits Questionnaire (CAT-Q) assesses camouflaging strategies in adults, including Compensation, Masking, and Assimilation.
The Girls Questionnaire for Autism Spectrum Condition (GQ-ASC) assesses autism-related traits in adult women, including camouflaging, social coping, sensory sensitivity, and gender-related presentation patterns.
This section includes measures of restricted interests, repetitive behaviors, routines, preference for sameness, and systemizing tendencies. These constructs are not identical, but they often describe related aspects of structure, predictability, rules, and focused patterns in autistic profiles.
The Repetitive Behaviours Questionnaire (RBQ-3, RBQ-2A) assesses restricted and repetitive behaviors.
The Systemizing Quotient (SQ-R) assesses the tendency to analyze, construct, and engage with rule-based systems.
Sensory measures describe heightened sensitivity, reduced sensitivity, sensory seeking, sensory avoidance, and other atypical responses to sensory input.
The Glasgow Sensory Questionnaire (GSQ) assesses sensory sensitivity across multiple modalities and was developed for adults on the autism spectrum.
The Sensory Perception Quotient (SPQ) assesses sensory sensitivity at a more perceptual level, focusing on basic sensory thresholds across modalities such as vision, hearing, and touch.
The Adolescent/Adult Sensory Profile assesses sensory processing patterns in everyday life. © proprietary
⇒ Empathy. Autism has often been studied through empathy, emotional understanding, and theory of mind. Measures such as the Empathy Quotient describe these related processes, but they do not measure autism as a whole.
⇒ Social intelligence. Some autism-related questions concern the ability to read social cues, infer mental states, and understand implicit social rules. Tasks such as the RMET are closer to social-cognitive assessment than to autism screening itself.
⇒ Intolerance of Uncertainty. Preference for predictability and difficulty adapting to change are important in many autistic profiles.
⇒ Alexithymia may influence emotional awareness, communication, empathy, and self-regulation in autistic people. However, it is not specific to autism and is better treated as a related emotional construct.
⇒ Autism and ADHD frequently overlap in attention, executive functioning, impulsivity, sensory regulation, and daily organization difficulties.
Assessment of autism-related characteristics requires a profile-based approach. Broad screening measures describe general autistic traits, while more specific instruments focus on developmental history, restricted and repetitive behaviors, sensory processing, systemizing, camouflaging, and broader autism phenotype traits.
These domains are related but not interchangeable. Similar total scores may reflect different combinations of social-communication differences, sensory sensitivity, routines, cognitive style, compensatory strategies, and developmental history.
Scores may also be influenced by age, gender, language, intellectual ability, self-awareness, camouflaging, mental health, and item interpretation. For this reason, autism-related questionnaires should be interpreted as part of a broader profile rather than as a single cutoff, label, or diagnostic conclusion.