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Checklist for Autism Spectrum Disorder (CASD)

Checklist for Autism Spectrum Disorder (CASD) Test

Get a clearer sense of autism related traits in a child in about 6 minutes. With 30 focused items, it supports quick screening and helps guide next steps for evaluation.

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Questions: 306 minutes

Hi! My name is Freudly, i am an AI therapist, I will give you an interpretation of the test after you complete it.

08:30

October 2, 2025

October 2, 2025
Material has been updated

October 2, 2025
Material has been published

23,987 views

2,525 completions

1,396 likes

Verified by Daniel Hall

Psychologist with 25 years of experience

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How the Scales are Structured

example score

64/100

CASD Total Score (CTS)

Measures the level of autism-related traits reported for a child to support screening and preliminary risk estimation.

Low indications

Moderate indications

High indications

0 – 33: Low indications | 34 – 66: Moderate indications | 67 – 100: High indications

A score of 64 falls in the Moderate indications range, suggesting a notable presence of autism-related traits and supporting consideration of further professional evaluation if clinically warranted.

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DATA-BASED USER COHORTS

Who Usually Takes This Test?

Concerned parents and guardians

46%OF USERS

Parents who notice differences in their child’s communication, social interaction, or behavior use it to get a quick first sense of whether an autism evaluation may be needed.

Teachers and school staff

33%OF USERS

Educators and support staff complete it to document observed behaviors and flag students who may benefit from further assessment.

Clinicians in initial intake

21%OF USERS

Pediatric and mental health professionals use it during parent interviews to structure screening and decide on next diagnostic steps.

BASED ON AGGREGATED, ANONYMIZED DATA FROM TENS OF THOUSANDS OF FREUDLY USERS.

RESULTS YOU CAN ACTUALLY USE

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Get insights on behavioral and thought patterns you might not notice on your own. By uncovering subtle connections between your responses, you’ll better understand what may be driving your current results.

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Used in 52+ countries

Benchmarking

See How You Compare

Once you complete the test, your results are compared with real-world data from people in your country.
Below is a preview of how scores are typically distributed across each scale.

CASD (Autism Spectrum Disorders Questionnaire) (C(SDQ)

Average

68.7

Normal range

55.7 — 81.7

min.

max.

100

Majority

This curve shows how scores are typically distributed.
Once you complete the test, your result will appear on the scale so you can see how you compare.

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CLEAR ANSWERS TO COMMON QUESTIONS

Frequently Asked Questions

What does this questionnaire measure?

It screens for behavioral and communication features commonly associated with autism in children. It helps determine whether further diagnostic evaluation is warranted.

Who can complete it?

A clinician may complete it based on a structured interview with a parent or caregiver. For screening or research, parents, teachers, or caregivers may complete it directly.

How long does it take and how many items are included?

It includes 30 items and typically takes about 6 minutes to complete. Time may vary based on how much information is available about the child.

How are the results interpreted?

Higher scores indicate more reported features associated with autism and support the need for follow-up assessment. Scores do not replace a comprehensive clinical evaluation.

How should responses be provided?

Responses should reflect typical behavior across settings and over time, not isolated events. If information is unclear, the best-supported response should be selected based on available observations.

WHAT THE TEST MEASURES

About This Assessment

Checklist for Autism Spectrum Disorder (CASD) Test - Symptoms and Signs

autism

When there are concerns about autism-related behaviors, the Checklist for Autism Spectrum Disorder (CASD) can be used to obtain an initial, structured overview of symptoms. It is a brief rating-based instrument developed by Mayes, S. to support clinical decision-making.

The measure focuses on observable behaviors and communication characteristics commonly associated with autism spectrum presentations. It may be completed based on a clinician’s structured interview with a caregiver, or used as a questionnaire completed by caregivers and, when appropriate, educators, with interpretation guided by the respondent and setting.

The Checklist for Autism Spectrum Disorder (CASD) includes 30 items and typically takes about 6 minutes to complete. Results are intended to inform whether further comprehensive evaluation is warranted and should be interpreted in the context of collateral history and other assessment data.

Author: Mayes, S.

Literature: Lord, C., Rutter, M., DiLavore, P. C., & Risi, S. Autism diagnostic observation schedule (ADOS) manual. Western Psychological Services. 2002.

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