Your child’s pediatrician hands you a checklist at the nine-month or two-year well visit. You’re asked to mark how often your child makes eye contact, responds to their name, or plays with other kids. That checklist might be the M-CHAT, the SCQ — or it might be the CAST autism screening test, one of the most widely used tools for identifying early signs of autism spectrum disorder in school-age children.
The CAST — short for the Childhood Autism Spectrum Test — isn’t a diagnosis. It’s a standardized parent-report questionnaire that helps clinicians figure out which children need a more comprehensive evaluation. Understanding how it works, how to interpret the results, and what happens next can help you navigate this process with a clearer head.
This guide walks through everything parents in North Carolina need to know about autism CAST testing: what it measures, how it’s scored, what a positive screen means, and how to get a formal evaluation if your child’s score raises a flag.
What Is the Childhood Autism Spectrum Test (CAST)?
The Childhood Autism Spectrum Test is a 37-item parent-report questionnaire designed to identify children who may be on the autism spectrum. It was developed by researchers at Cambridge University and has been validated across multiple studies as a reliable screening tool for children ages 4 to 11.
Parents answer each question yes or no based on their child’s typical behavior. The questions cover a range of areas: social interaction, communication, repetitive behaviors, and specific interests. A clinician — typically a pediatrician, developmental specialist, or BCBA — reviews the completed form and scores it against a clinical threshold.
Unlike some screeners that focus only on very young children, the CAST was designed specifically for school-age children. This makes it useful for families who didn’t receive a clear answer during early childhood screenings, or whose child’s differences became more noticeable once they entered a structured classroom environment.
One important distinction: the CAST identifies children who may benefit from further evaluation. It does not diagnose autism. A positive screen means your child’s responses fall above a threshold that warrants a more thorough look — not that they have autism spectrum disorder.
For parents beginning this process, we provide comprehensive autism diagnostic evaluations in Raleigh — often with shorter wait times than hospital systems.
How Is the CAST Autism Screening Test Scored?
Scoring the CAST is straightforward, though interpreting the results requires clinical context. Of the 37 items, 31 are scored. Each scored item is worth one point — a response indicating potential autism-related behavior adds a point to the total.
A score of 15 or higher is generally considered the clinical threshold for further evaluation. Children who score above this cutoff are typically referred for a more comprehensive diagnostic assessment — not because a diagnosis is certain, but because their profile suggests autism-related traits that warrant a closer look by a qualified clinician.
Scores below 15 don’t rule out autism. The CAST has good sensitivity — meaning it catches a high percentage of children who do have ASD — but no screening tool is perfect. If you have persistent concerns about your child’s development even after a low CAST score, those concerns are worth discussing with your pediatrician or a BCBA.
The six items that are not scored were designed as catch questions to assess response reliability. If a child scores unusually high on these items, the clinician may consider whether the results accurately reflect the child’s behavior.
How Does the CAST Compare to Other Autism Screening Tools?
The CAST is one of several validated autism screening tools used by clinicians. The most commonly used alternatives are the M-CHAT-R/F (for toddlers 16–30 months), the SCQ (Social Communication Questionnaire), and the AQ (Autism Spectrum Quotient). Each has its strengths, and clinicians often choose based on the child’s age and the clinical question being asked.
| Tool | Age Range | Format | Best Used For |
|---|---|---|---|
| CAST | 4–11 years | 37-item parent report | School-age children; structured classroom context |
| M-CHAT-R/F | 16–30 months | 20-item parent report | Early toddler screening at well visits |
| SCQ | 4+ years | 40-item parent report | Broader social communication concerns |
| AQ | 4+ years (child version) | Parent or self-report | Research and clinical settings; higher-functioning profiles |
The CAST’s particular strength is its focus on the 4–11 age range — an age group that can fall through the cracks of early-childhood screeners designed for toddlers. Many families we work with at Triangle ABA come to us after their child’s toddler M-CHAT came back normal, only to see more noticeable differences emerge in kindergarten or first grade. The CAST was designed specifically for that scenario.
For families who have concerns about their child’s development and want to understand whether ABA therapy might be appropriate, our guide to insurance coverage for ABA therapy in NC explains how most major plans handle coverage once a diagnosis is in place.
For Triangle-area families specifically, we serve children throughout Raleigh, NC and surrounding communities.
📣 Concerned about your child’s CAST results? Triangle ABA provides comprehensive autism diagnostic evaluations in Raleigh and Garner, NC — often with shorter wait times than hospital systems. Call (919) 504-4171 or request a free consultation at triangleaba.com.
What Happens After a Positive CAST Screen in North Carolina?
A positive CAST score — 15 or higher — is the start of a process, not the end of one. In North Carolina, families typically have a few different pathways for getting a formal autism evaluation after a positive screen.
Through your pediatrician: Most pediatricians will provide a referral to a developmental pediatrician or a psychologist who specializes in autism evaluations. In the Triangle, that often means UNC Health, Duke Children’s Hospital, or WakeMed — all of which have specialized teams but can carry wait times of several months to over a year.
Through a private provider: Clinics like Triangle ABA offer comprehensive diagnostic evaluations led by Board Certified Behavior Analysts. BCBA-led evaluations are recognized by insurance carriers and can often be completed significantly faster than hospital-system referrals. We typically complete assessments within a few weeks of starting the intake process.
Through the school system: If your child is school-age, the Wake County Public School System or your local school district is required to evaluate any child suspected of having a disability at no cost to the family. This evaluation is separate from a clinical autism diagnosis and focuses on educational eligibility — but it can be a parallel step worth initiating.
One thing we hear from Triangle-area families often: having a referral letter and the completed CAST results in hand when you contact any evaluation provider speeds up the intake process considerably. Bring what you have — the more documentation a clinician can review before the appointment, the faster they can get to the assessment itself.
Once your child has a formal diagnosis, the next question is usually about ABA therapy coverage. Our guide to ABA therapy insurance in NC walks through what major NC plans require and how Triangle ABA handles authorization.
What Should I Do If I’m Concerned About My Child Before a Formal Evaluation?
Waiting for an evaluation — whether it’s two weeks or six months — is hard. The most useful thing families can do during that window is document what they’re seeing.
Keep a simple log: note the specific behaviors that concern you, the situations in which they appear, and how your child responds when those situations change. This documentation doesn’t need to be clinical or formal — a notes app on your phone is fine. But the specifics matter. “My child doesn’t like loud noises” is less useful to a diagnostician than “my child covers their ears and cries when the school bell rings and needs 10–15 minutes to regulate before they can return to class.”
If you’re already working with a speech therapist, occupational therapist, or your child’s school IEP team, ask them to share any behavioral observations they’ve documented. Clinicians evaluating for autism spectrum disorder are looking for a pattern of behavior across multiple settings — the more contexts you can document, the clearer that picture becomes.
In the meantime, some children benefit from targeted skill-building even before a formal diagnosis is in place. ABA therapy specifically requires a formal ASD diagnosis for insurance coverage, but not all skill-building programs have that requirement.
Frequently Asked Questions
Is the CAST the same as a diagnosis? No. The CAST is a screening tool — it identifies children who may warrant further evaluation, not children who have autism. A formal autism diagnosis requires a comprehensive evaluation conducted by a licensed clinician, such as a psychologist, developmental pediatrician, or BCBA. A high CAST score is a signal to seek that evaluation, not a diagnosis in itself.
How do I get a CAST screening for my child in Raleigh? Your child’s pediatrician can administer the CAST at a well visit, or you can request it specifically. Some clinics, including Triangle ABA, incorporate standardized screeners into their initial intake process. For a full diagnostic evaluation, contact Triangle ABA at (919) 504-4171 or see our autism evaluation services in Raleigh.
What score on the CAST means my child should be evaluated? A score of 15 or higher on the CAST is generally considered the clinical threshold that warrants a more comprehensive evaluation. That said, any score that concerns you — or any persistent behavioral patterns regardless of the number — is worth discussing with your pediatrician or a specialist. The cutoff score is a guideline, not a gate.
Does insurance cover autism diagnostic evaluations in NC? Most major insurance plans in North Carolina — including Blue Cross Blue Shield, Medicaid, Alliance, Trillium, and others — cover medically necessary autism diagnostic evaluations. Triangle ABA verifies your insurance before the assessment begins. For a full breakdown of insurance coverage for ABA services in NC, see our guide to ABA therapy insurance coverage.
How is the CAST different from other autism screening tests? The CAST is specifically designed for children ages 4–11 — filling a gap between early toddler screeners like the M-CHAT and adult tools. Its 37-item format covers social, communication, and repetitive behavior domains, making it useful when early screenings came back unremarkable but school-age behavior raised new concerns.
Next Steps After an Autism CAST Screening
The CAST autism screening test is a tool, and tools are only useful when someone acts on what they show. If your child’s score raises a flag — or if your own observations have been telling you something is worth looking into — the most important step is to pursue a formal evaluation rather than waiting to see if things change on their own.
At Triangle ABA, we know this process is stressful. Our clinical team provides comprehensive autism diagnostic evaluations in Raleigh and Garner, led by Board Certified Behavior Analysts who have worked with hundreds of Triangle-area families. We walk you through every step — from initial intake to results and recommendations — so you leave with answers and a plan, not just a score.
Early evaluation leads to earlier support, and earlier support leads to better outcomes. If you’re ready to take the next step, we’re ready to help.
📣 Schedule a free consultation with Triangle ABA — serving Raleigh, Garner, Durham, Cary, and families across the Triangle. Call (919) 504-4171 or book online.