Autism Spectrum Quotient (AQ) — screening questionnaire for autistic traits

Structure and scoring

The AQ comprises 50 items covering several behavioral and cognitive domains associated with autism. Respondents endorse items on a simple agree/disagree scale, and responses are combined into a total score typically ranging from 0 to 50. Higher totals indicate a greater number of autistic traits. Researchers and clinicians commonly use a cutoff score to flag individuals for further assessment, though precise thresholds and interpretation can vary by context and population.

• Five commonly reported subscales: social skill, attention switching, attention to detail, communication, and imagination.
• Forms: long 50‑item AQ, shorter versions such as AQ‑10, and parent/other‑report adaptations for use with different age groups.

History and development

The AQ was developed to provide a simple, standardized measure of autistic traits that could be used in both community and clinical research. Its creators intended it to help identify people who might benefit from a full clinical assessment. Since its release it has been translated and adapted for many languages and settings, and it has been used widely in epidemiological studies and experimental research on autism.

Uses, strengths and limitations

Uses of the AQ include screening referrals to specialist services, participant selection in research, and informal self‑assessment. Strengths of the instrument are its brevity and ease of administration. However, it is important to recognize limitations: the AQ is not a diagnostic instrument and cannot replace a full clinical evaluation. Scores can be influenced by culture, language, response style, co‑occurring conditions, and deliberate masking of traits. Self‑diagnosis based solely on AQ results is discouraged; a comprehensive assessment by qualified professionals is recommended when concerns are present.

Practical considerations

• Who can use it: typically teenagers and adults with average or above intellectual functioning; adaptations exist for other groups.
• Interpretation: elevated scores suggest the need for further assessment rather than proving a diagnosis.
• Availability: widely available in academic publications and online, often in multiple languages; short forms (e.g., AQ‑10) are used for rapid screening.

For background on the originating research centre see Autism Research Centre and its UK context at United Kingdom. Information about applicability to people of average intelligence is discussed in materials such as guidance for test use. For broader context about autism and diagnostic pathways see resources on autism and on autism spectrum conditions.