| Type | Diagnostic support — clinician-completed rating scale |
|---|---|
| Age range | 2 years and up |
| Format | 15 items rated by the clinician after observing the child and interviewing caregivers; a parent questionnaire supplements it |
| Forms | Standard (ST) — for younger children or those with notable language/cognitive delays; High-Functioning (HF) — for verbally fluent children 6+ with IQ above 80 |
| Who administers | Psychologists, developmental pediatricians, trained diagnostic teams |
What the 15 items rate
Each item is scored from "within normal limits for age" to "severely unusual": relating to people, imitation, emotional response, body and object use, adaptation to change, sensory responses (visual, listening, taste/smell/touch), fear or anxiety, verbal and nonverbal communication, activity level, consistency of intellectual response, and the clinician's overall impression.
Reading the score
Because each of the 15 items scores at least 1 point, totals on the Standard form run from 15 to 60, not from zero. The published bands are 15–29.5 for minimal-to-no symptoms, 30–36.5 for mild-to-moderate, and 37–60 for severe. As always on this site: the number supports a clinical judgment — it doesn't replace one, and the cut-points differ on the High-Functioning form.
Where you'll encounter it
The CARS-2 is quicker and cheaper to administer than an ADOS-2, so it appears often in early-intervention evaluations, school assessments, and clinics with long specialist waitlists. A thorough evaluation may use it alongside — or as a structured complement to — direct observational instruments. If CARS-2 is the only instrument used and the stakes are high (e.g., a disputed school eligibility), it's reasonable to ask whether an observational measure will be added.
Severity scores describe today, not forever. CARS-2 (like the ADOS-2 comparison score) describes how prominent autism-related behaviors were at this point, in this setting. Children develop, support helps, and no early severity number is a prediction of a life.
Medical disclaimer: Educational information only. The CARS-2 is a published instrument (Schopler et al., WPS). This page cannot diagnose anyone; consult a qualified clinician.