Maybe you’ve spent years wondering why certain things are harder for you than they are for everyone else. Maybe your toddler isn’t hitting milestones the way the parenting books say they should. Either way, a search for answers often leads to the same place: an online autism screener.
These tools work like any other symptom checker — the kind you’d use to see if your sore throat might be strep. You answer a set of questions, get a score, and use that score to decide whether you need to pursue something more. For autism specifically, that “something more” is an evaluation with a licensed provider.
A positive screen is a reason to look further, not a diagnosis. Here’s what five screeners actually measure, who they’re for, and what a result should — and shouldn’t — mean to you.
Autism screeners and tests at a glance
| Screener | Who it’s for | Completed by | What it measures |
|---|---|---|---|
| M-CHAT | Toddlers, 16–30 months | Parent/caregiver | Early developmental domains: communication, joint attention, repetitive movements, pretend play |
| CAST | Children, 4–11 | Parent | Social and communication development |
| RAADS-R | Teens and Adults, Ages 16+ | Self-report | Social relatedness, circumscribed interests, language, sensory-motor differences |
| CAT-Q | Teens and Adults,Ages 15+ | Self-report | Social camouflaging (compensation, masking, assimilation) |
| RBQ-3 | Children, Teens, and Adults, Self-report ages 13+; informant version from 15 months | Self or informant | Restricted/repetitive behaviors: insistence on sameness, repetitive sensory-motor behaviors |
M-CHAT (Modified Checklist for Autism in Toddlers)
The M-CHAT is a parent-report questionnaire used to identify toddlers between 16 and 30 months old who may be at risk for autism. Pediatricians often administer it at routine toddler check-ups. It assesses early developmental domains such as communication, joint attention, repetitive movements, and pretend play. A positive result suggests the need for a more comprehensive evaluation.
CAST (Childhood Autism Spectrum Test)
The CAST is completed by parents of children ages 4–11 to screen for developmental differences in social and communication functioning.
RAADS-R (Ritvo Autism Asperger Diagnostic Scale-Revised)
The RAADS-R is an 80-item self-report questionnaire developed to screen for autistic traits in individuals aged 16 and up; it is not normed on younger teens or children. It assesses social relatedness, circumscribed interests, language, and sensory-motor differences. Each item offers four response options, and respondents indicate whether a statement is true now and/or was true only in childhood, or has never been true. A high score suggests that consulting a psychologist may be worthwhile — it does not necessarily mean you are autistic.
CAT-Q (Camouflaging Autistic Traits Questionnaire)
Autism doesn’t always look the way people expect, especially in those who’ve learned to mask their traits. The CAT-Q is a 25-item self-report measure of an individual’s reported use of social camouflaging strategies. Items are rated on a 7-point Likert scale, from strongly disagree to strongly agree, and fall into three subscales:
- Compensation — learning strategies to offset perceived social differences, such as picking up social skills from a television show.
- Masking — suppressing autistic characteristics, such as keeping your hands in your pockets to avoid stimming.
- Assimilation — pushing through socially aversive situations and pretending to fit in.
Total scores range from 25–175, with higher scores reflecting greater use of camouflaging. Research shows CAT-Q scores tend to be higher in autistic people than non-autistic people, and higher in autistic women than autistic men. A high score indicates a high degree of camouflaging — it does not mean you are autistic. The CAT-Q was initially validated in adults, though a more recent study found it reasonably valid for those 15 and older.
RBQ-3 (Repetitive Behavior Questionnaire-Third Edition)
The RBQ-3 measures the type, frequency, and intensity of restricted and repetitive behaviors. It includes a self-report version (ages 13 and up) and an informant version (ages 15 months and up), organized around two primary subscales: insistence on sameness and repetitive sensory-motor behaviors.
Your autism screener was positive — now what?
A screener is a starting point. On its own, it can’t tell you whether you or your child is autistic. What it can do is help you decide whether a more comprehensive evaluation is worth pursuing.
If you’re a parent with a positive M-CHAT or CAST result, you can start with your pediatrician, who can refer you for an evaluation, or seek an evaluation on your own. If you’re a child or teen, speak to a parent or trusted adult about the need for an evaluation. For adults with a high RAADS-R or CAT-Q score, the next step is typically finding a licensed psychologist who conducts autism evaluations. A comprehensive assessment involves an extensive clinical interview, direct behavioral observation, and standardized testing. Whatever the result, remember what these tools were built to do. They flag the need for a closer look. They were never meant to replace it.
References
Cancino-Barros, I., Villacura-Herrera, C. & Castillo, R.D. A meta-analytic review of quantification methods for camouflaging behaviors in autistic and neurotypical individuals. Sci Rep 15, 22885 (2025). https://doi.org/10.1038/s41598-025-06137-z
Jones, C.R., Livingston, L.A., Fretwell, C. et al. Measuring self and informant perspectives of Restricted and Repetitive Behaviours (RRBs): psychometric evaluation of the Repetitive Behaviours Questionnaire-3 (RBQ-3) in adult clinical practice and research settings. Molecular Autism 15, 24 (2024). https://doi.org/10.1186/s13229-024-00603-7
Ritvo RA, Ritvo ER, Guthrie D, Ritvo MJ, Hufnagel DH, McMahon W, Tonge B, Mataix-Cols D, Jassi A, Attwood T, Eloff J. The Ritvo Autism Asperger Diagnostic Scale-Revised (RAADS-R): a scale to assist the diagnosis of Autism Spectrum Disorder in adults: an international validation study. J Autism Dev Disord. 2011 Aug;41(8):1076-89. doi: 10.1007/s10803-010-1133-5. PMID: 21086033; PMCID: PMC3134766.
