What is the CARS-2 used for?

The CARS-2 helps clinicians identify autism spectrum disorder and grade its severity in children and adults. An observer rates 15 behavioral domains after direct observation and history, producing a total score that supports diagnostic decision-making. It works alongside developmental history and other tools, not as a standalone diagnosis.

How many items are on the CARS-2 and how is it scored?

The CARS-2 contains 15 behavioral domains. A clinician rates each domain from 1, meaning within normal limits, to 4, meaning severely abnormal, and half-point ratings are allowed. The ratings sum to a total between 15 and 60, where higher scores reflect more autism-related characteristics observed in the person.

What do CARS-2 scores mean?

On the Standard form, totals from 15 to 29.5 fall in the minimal-to-no symptoms range, 30 to 36.5 indicate mild-to-moderate autism, and 37 to 60 indicate severe autism. These bands are interpretive guidelines rather than fixed boundaries, and the High-Functioning form uses slightly different cutoffs.

What is the difference between the CARS2-ST and CARS2-HF forms?

The Standard form suits children under six, or older individuals with communication difficulties or an IQ of 79 or below. The High-Functioning form is designed for verbally fluent people aged six and older with an IQ of 80 or above. Both share the same 15 to 60 scoring range.

Who can administer the CARS-2?

The CARS-2 rating scales are completed by trained professionals such as psychologists, developmental pediatricians, and clinicians experienced in autism assessment. Ratings draw on direct observation, records, and caregiver report. A separate unscored caregiver questionnaire gathers parent observations, which the clinician uses to inform the domain ratings.

Is the CARS-2 a diagnostic test for autism?

No. The CARS-2 is a rating scale that supports, but does not replace, a comprehensive diagnostic evaluation. Elevated scores prompt further assessment against diagnostic criteria. Clinicians interpret results alongside developmental history, medical findings, and other measures before reaching any conclusion about an autism diagnosis for the individual.

CARS-2 Questions for Parents | Template & auto-scoring

The Childhood Autism Rating Scale, Second Edition (CARS-2) is a clinician-completed rating scale used to identify autism spectrum disorder and gauge symptom severity in children and adults. Across 15 behavioral domains, an observer rates each area from typical to severely atypical, producing a total score that supports diagnostic decision-making alongside developmental history and direct observation.

Why healthcare providers use the CARS-2

Structured autism identification. It gives providers a consistent, observation-based framework for rating autism-related behaviors instead of relying on impression alone.
Severity grading. Beyond a yes-or-no signal, the total score sorts presentations into minimal, mild-to-moderate, and severe ranges to guide clinical decision-making.
Broad applicability. The scale is used across a wide age range, from young children through adults, with forms suited to different developmental levels.
Form flexibility. Standard and High-Functioning versions let clinicians match the tool to a person's verbal ability and cognitive level.
Established track record. Decades of use and research make it a widely recognized reference in autism assessment.

Which settings use the CARS-2?

Developmental pediatrics. Clinics evaluating developmental delays use it as part of a structured autism workup.
Child psychology and psychiatry. Practices assessing behavioral and social concerns apply it to help clarify diagnosis and severity.
Early intervention and schools. Multidisciplinary teams use it to support eligibility decisions and plan appropriate services.
Speech and behavioral therapy. Therapists use it to characterize baseline presentation before and during treatment.

What does the CARS-2 measure?

The CARS-2 rates observable behaviors associated with autism spectrum disorder across 15 functional domains. Because the instrument is copyrighted by its publisher, the domains are described here in general terms rather than reproduced item by item. The domains span the following areas:

Social and emotional responses. Relating to people, imitation, and emotional response.
Sensory and physical patterns. Body use, object use, and visual, listening, and taste, smell, and touch responses.
Communication and adaptation. Verbal and nonverbal communication, adaptation to change, and activity level.
Overall clinical impression. Consistency of intellectual response and the rater's general impressions.

Scoring the CARS-2

Number of items: 15 behavioral domains.
Per-item scale: each domain is rated from 1, within normal limits for age, to 4, severely abnormal, with half-point ratings allowed.
Total score range: 15 to 60.
Score direction: higher scores indicate more autism-related characteristics.

These cutoffs come from the Standard form (CARS2-ST); the High-Functioning form (CARS2-HF) uses slightly different thresholds, and raw scores can be converted to T-scores and percentiles. The ranges are interpretive guidelines rather than fixed boundaries, so scores near a cutoff should be read within the full clinical picture. The CARS-2 supports, but does not replace, a comprehensive diagnostic evaluation.

Score	Interpretation	Suggested next step
15 to 29.5	Minimal-to-no symptoms of autism	Monitor and consider other explanations
30 to 36.5	Mild-to-moderate autism	Consider comprehensive evaluation
37 to 60	Severe autism	Consider comprehensive evaluation

Best practices for administration

Use trained raters. The scale is intended for professionals familiar with autism presentation and the scoring criteria.
Draw on multiple sources. Base ratings on direct observation together with records and caregiver report, not a single interaction.
Match the form to the person. Choose the Standard or High-Functioning version based on age, verbal ability, and cognitive level.
Rate against age expectations. Judge each behavior relative to what is typical for the person's age.
Interpret in context. Treat the total as one input to a broader diagnostic process rather than a standalone verdict.

How Zentake helps with the CARS-2

Automatic scoring. Zentake totals each submission instantly, so there is no hand-tallying of domain ratings.
Longitudinal tracking. You can re-send it on a schedule and view change over time as part of ongoing monitoring.
Before the visit. Pediatrics practices can collect the caregiver questionnaire from home on any device, so the clinician starts informed.
HIPAA compliant. Responses are encrypted, with a signed BAA on every plan.

References

Schopler E, Van Bourgondien ME, Wellman GJ, Love SR. Childhood Autism Rating Scale, Second Edition (CARS-2). Los Angeles: Western Psychological Services; 2010. This manual is the primary source for the instrument's items, scoring, and severity classifications, which are copyrighted by the publisher.

The Standard-form cutoff ranges (15 to 29.5, 30 to 36.5, and 37 to 60) reflect the classifications carried forward from the original Childhood Autism Rating Scale and reported in the CARS-2 manual and independent clinical summaries.

Last updated: August 2026

CARS-2 Questions for Parents