Online Autism Screening Tools for Children
Something feels different. Maybe your child isn't quite hitting the same milestones as other children their age, or their pediatrician suggested taking a closer look. An autism screener is a simple, no-cost first step that can help bring some of your questions into focus.

What are the steps in the autism diagnostic process?
Wondering how to test for autism or where to begin an early autism evaluation? Here's what the process looks like at ABC.

1. Complete a no-cost online screener
The first step is completing a simple online autism screening tool that can be completed at home. Screeners can help identify your child's autism risk and give insight into whether further evaluation is needed.
2. Schedule an autism evaluation
The next step is an in-person or telehealth evaluation. Children are also often referred for an evaluation after concerns come up at a pediatrician visit. Depending on your region and your child's needs, this will be an:
3. Review results & confirm diagnosis
Based on a combination of evaluation results, parent questionnaires, and your child's developmental history, your doctor or psychologist will determine the next steps.
Why an autism diagnosis matters
Early diagnosis opens the door to early intervention, and early intervention has been shown to support better long-term outcomes for autistic children.1 Many families find that having a diagnosis brings clarity and opens doors to a support system they didn't have before.
A diagnosis is often required before a child can:
- Access evidence-based autism services like applied behavior analysis (ABA) therapy
- Receive insurance coverage for autism treatment
- Qualify for special education support and school accommodations

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M-CHAT-R screening tool for autism in toddlers
The M-CHAT-R is a 20-question yes/no questionnaire parents complete about their child's behavior. It's designed to identify toddlers who may be at risk for autism and is one of the most widely used early screening tools available.
- Takes just a few minutes to complete at home
- A high-risk score does not confirm an autism diagnosis
- An autism specialist should further assess children who receive a high-risk score
The CAST autism screening tool for older children
The Childhood Autism Spectrum Test (CAST) is a parent questionnaire developed by the Autism Research Centre (ARC) at the University of Cambridge.¹
- Designed for school-age children
- A high score suggests your child may benefit from further evaluation
- A high score does not confirm an autism diagnosis

What’s the difference between the M-CHAT-R and the CAST?
Both screening tools are designed to help identify signs of autism early. Here's a simple breakdown to help you choose the right one for your child. Not sure which screener makes sense? Contact us and we can help!
M-CHAT-R
- For toddlers (16 months to 3 years old)
- 20 yes/no questions
- Screens for early autism risk in toddlers
CAST
- For school-age (4 to 11 years old)
- 39 yes/no questions
- Screens for autism symptoms and communication difficulties