The M-CHAT: the free 5-minute screening, explained.
Clinically reviewed by Ruth Gluck, MSEd, BCBA
The M-CHAT is a free screening questionnaire that checks a toddler's risk for autism. A parent answers about 20 yes-or-no questions — five minutes, usually at the 18- or 24-month checkup. It is not a diagnosis. It simply tells you whether a full evaluation is worth doing. Here's how it works.
What is the M-CHAT?
M-CHAT stands for Modified Checklist for Autism in Toddlers. It's a short questionnaire — filled out by you, not your child — designed for toddlers between about 16 and 30 months. The current version is called the M-CHAT-R/F (revised, with follow-up).
It exists to solve a real problem: early signs of autism are easy to miss, and toddlers who would benefit from help often wait years for it. A five-minute checklist at a routine checkup catches many of those kids early. That's why checkup guidelines call for autism screening for every child at the 18- and 24-month visits — not just children someone is already worried about.
How does the screening work?
You answer roughly 20 yes-or-no questions about things you see every day: Does your child point to show you something interesting? Respond to their name? Look where you point? Pretend, wave, and check your reactions? No test is done on your child — you're the expert witness, and your everyday observations are the data.
The answers add up to a risk score: low, medium, or high. Medium scores usually get a short follow-up conversation with the doctor — the 'F' in M-CHAT-R/F — which sorts out toddlers who missed a question for ordinary reasons from those who should be evaluated. The questionnaire itself is copyrighted (free for clinical use), so we won't reproduce it here — and you shouldn't self-score from random websites either. Take it with your child's doctor, where the follow-up questions and the next steps come attached.
What the score means — and doesn't
A high or medium score does not mean your child has autism. It means the screen found enough to make a real evaluation worthwhile. Plenty of children who screen positive turn out not to be autistic — some have hearing issues, a language delay, or just an off day at 18 months old.
A low score, in turn, doesn't guarantee everything is fine — screens miss some children, which is why the checkup repeats it at 24 months. The rule that serves parents best: the M-CHAT can open the evaluation door, but your own gut can too. If your worry persists after a low score, ask for the referral anyway. Screens are a floor, not a ceiling, on parental concern.
What happens after a positive screen?
The next step is a full diagnostic evaluation with a specialist — the real, careful look that a checklist can't provide. Ask your child's doctor for referrals, and get on a list quickly; evaluation waitlists can run months. If your child is under three, also call your state's early intervention program, which evaluates free of charge and doesn't need a referral.
This in-between stretch — screened positive, waiting for the evaluation — is exactly where we spend our days helping families. Our get-a-diagnosis guide maps the path in Kansas and Colorado, and a 15-minute call gets you a person who knows which waitlists near you are actually moving.