Autism-Spectrum Quotient (AQ) Test

by Psychology Roots

Autism-Spectrum Quotient (AQ) Test

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About Autism-Spectrum Quotient (AQ) Test

Scale Name

Autism-Spectrum Quotient (AQ) Test

Author Details

Simon Baron-Cohen

Translation Availability

Not Sure


The Autism-Spectrum Quotient (AQ) test emerged in 2001 as a tool for assessing autistic traits in adults. Developed by Simon Baron-Cohen and his team, the AQ wasn’t intended to diagnose autism spectrum disorder (ASD) definitively, but rather to serve as a screening instrument.

The AQ test takes the form of a self-administered questionnaire. It presents individuals with 50 statements about their preferences and behaviors. These statements delve into areas like social interactions, attention to detail, and imagination. By responding to whether they agree or disagree with each statement, the test aims to quantify autistic traits the person might possess.

The AQ offers several advantages. Firstly, it’s a self-administered test, meaning individuals can take it independently without needing a healthcare professional present. Secondly, it’s designed for adults aged 16 and over, catering to a population segment where formal diagnosis might be less readily pursued.

However, it’s important to remember that the AQ test has limitations. As a self-report measure, its accuracy hinges on the honesty and self-awareness of the test-taker. Additionally, the AQ is not suitable for children and a high score doesn’t guarantee an ASD diagnosis.

Overall, the Autism-Spectrum Quotient test serves as a valuable initial screening tool for adults who suspect they might be on the autism spectrum. It can prompt further evaluation by qualified healthcare professionals who can provide a comprehensive diagnosis.

Administration, Scoring and Interpretation

The Autism-Spectrum Quotient (AQ) test is designed for self-administration, meaning you can take it independently without needing a healthcare professional to guide you. Here’s what the administration typically involves:

  • Obtaining the Test: The AQ test is not a public document and isn’t readily available online. You might find research papers or websites describing the test’s purpose and scoring, but they usually won’t include the full questionnaire. To take the AQ officially, you would likely need to:
  • Consult a mental health professional who has access to the test.
    Locate a research study using the AQ where participation involves taking the test.
    Taking the Test: Once you have access to the AQ, you’ll find it’s a questionnaire with 50 statements. Each statement describes a behavior or preference.
  • Your task is to read each statement carefully and consider how well it applies to you.
    A typical response format uses a scale of 1 to 4, with 1 indicating “Definitely disagree” and 4 indicating “Definitely agree.” Some versions might use slightly different wording for the answer choices.
  • There are no time limits for completing the AQ, so take your time and answer honestly based on your own experiences.
    Scoring: After answering all the questions, you’ll need a scoring guide (which might not be provided with the test itself). The guide will explain how to add up your values from each question to get a total score.

Reliability and Validity

The Autism-Spectrum Quotient (AQ) test has been evaluated for both reliability and validity, with some positive results but also limitations to consider. Here’s a breakdown:


Internal Consistency: Studies generally show good internal consistency, meaning the questions within the AQ measure a similar underlying concept (autistic traits). This is reflected in Cronbach’s Alpha values typically above 0.7, indicating good internal reliability.
Test-Retest Reliability: Research suggests some variability. The original study reported good test-retest reliability, meaning someone taking the test twice within a short timeframe gets similar scores. However, other studies, particularly those using shorter versions of the AQ, found lower test-retest reliability.


Content Validity: The AQ questions appear relevant to autistic traits, like social interaction and attention to detail.
Construct Validity: Studies show some support for construct validity. For example, males tend to score higher than females, aligning with the higher prevalence of ASD diagnoses in males [2]. Additionally, AQ scores correlate with measures of social difficulties and neuroticism.
Discriminant Validity: Some evidence suggests the AQ can distinguish between autistic traits and other personality traits. For instance, AQ scores may not correlate strongly with openness, conscientiousness, or agreeableness.


Self-Report Measure: The AQ relies on self-awareness, which can affect accuracy.
Cut-off Scores: There’s debate about the optimal cut-off score for indicating potential ASD. The original study suggested 32+, but this might miss some cases and lead to false positives.
Not a Diagnostic Tool: The AQ is a screening instrument, not a definitive diagnostic tool. A high score may warrant further evaluation by a qualified professional.

Available Versions



Baron-Cohen, S., Wheelwright, S., Skinner, R., Martin, J., & Clubley, E. (2001). The autism-spectrum quotient (AQ): Evidence from asperger syndrome/high-functioning autism, malesand females, scientists and mathematicians. Journal of autism and developmental disorders31, 5-17.

Baron-Cohen, S., Wheelwright, S., Skinner, M., Martin, J., & Clubley, E. (2001). ” The Autism-Spectrum Quotient (QA): Evidence from asperger syndrome/high functioning autism, males and females, scientists and mathematicians”: Errata. Journal of Autism and Developmental Disorders.

Important Link

Scale File:

Frequently Asked Questions

What is the AQ test?
A self-administered questionnaire to assess autistic traits in adults (16+).

Is it a diagnostic tool?
No. It can indicate potential autism but doesn’t diagnose.

How is it administered?
You take it yourself, reading 50 statements and rating how well they apply to you.

How is it scored?
Points are added up, but you’ll likely need a professional scoring guide.

Is it reliable?
Somewhat. Questions seem to measure similar things, but scores might vary slightly if taken twice.

Is it valid?
Somewhat. The test content seems relevant, and scores align with some aspects of autism.

Are there limitations?
Yes. It relies on self-awareness, and the cut-off score for potential autism can be debated.


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