- Online "autism tests" are screeners. They can't diagnose. - The best-known toddler screener is the M-CHAT, for ages 16 to 30 months. - A higher-risk result means "talk to your doctor soon," not "your child is autistic." - A lower-risk result doesn't override your gut. Keep watching and keep asking.
What's the difference between screening and diagnosis?
Screening is a short checklist that sorts children into "look closer" or "keep watching." Diagnosis is a full evaluation by a trained specialist who observes your child, talks with you, and uses structured tools.13
Screening is fast and cheap, so it's used for everyone. Diagnosis takes time and expertise, so it's used when screening or a parent's concern suggests it. For the full process, read How is autism diagnosed in children?
What is the M-CHAT?
The M-CHAT (Modified Checklist for Autism in Toddlers) is a free, parent-completed questionnaire for toddlers 16 to 30 months old. Pediatricians often use it at the 18- and 24-month checkups, when the American Academy of Pediatrics recommends autism screening.12
It asks yes-or-no questions about things like pointing, responding to their name, pretend play and interest in other children. It takes about 5 minutes. The official version and scoring are free on the M-CHAT website.2
What does my child's result mean?
| Result | What it means | What to do |
|---|---|---|
| Lower risk | Few answers suggested concern today | Keep watching development; screen again at the next checkup; speak up if worries continue |
| Medium risk | Some answers suggested concern | Ask your pediatrician about the follow-up interview |
| Higher risk | Many answers suggested concern | Ask for a referral for a full evaluation and early intervention |
Many children who screen positive are not autistic but do have another developmental difference, like a speech delay, that's worth support.4
Are other online autism quizzes reliable?
Many online quizzes aren't validated, and some are written for adults. If you use one, treat it as a way to organize your thoughts, not as an answer.
A better use of 10 minutes: write down specific examples of what you've noticed, and take a short video or two. That helps your doctor far more than a quiz score.
What should I do next?
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Start with What are the early signs of autism?, and see How do I find an autism evaluation near me? when you're ready for the next step.