The M-CHAT Autism Screening: What Your Toddler's Score Means and What to Do Next

What is the M-CHAT autism screening?

The M-CHAT, short for Modified Checklist for Autism in Toddlers, is one of the most widely used autism screening tools for young children. The current version, the M-CHAT-R/F (Revised, with Follow-Up), was developed by researchers Diana Robins, Deborah Fein and Marianne Barton and is free to download for clinical use. It has two stages:

• The checklist (M-CHAT-R): 20 yes-or-no questions a parent answers about how their toddler usually behaves — broadly, how they communicate, play and respond to the people and world around them.
• The Follow-Up: a structured interview, usually with your child's doctor or trained clinic staff, that revisits only the answers that raised a flag and asks for real-life examples.

When do toddlers get screened for autism?

The M-CHAT-R is designed and validated for toddlers 16 to 30 months old. The American Academy of Pediatrics recommends autism-specific screening at the 18- and 24-month well-child visits, plus general developmental screening at 9, 18 and 30 months.

For children on Medical Assistance or MinnesotaCare, checkups happen through Child and Teen Checkups (C&TC), Minnesota's no-cost checkup program for kids under 21, and its standards use the same ages. C&TC guidance recommends autism screening at 18 and 24 months, or whenever a concern comes up — so you don't have to wait for a scheduled visit.

What does my child's M-CHAT score mean?

Each answer that points toward autism adds a point, for a total between 0 and 20. Older materials call the bands “risk” levels; in 2025 the authors switched to “likelihood,” but the scoring didn't change. Here's what each band usually leads to:

• Low likelihood (0–2): The screen is negative, and no follow-up is needed for now unless other signs raise concern. If your child is under 2, the authors recommend screening again after the second birthday.
• Moderate likelihood (3–7): Next comes the Follow-Up interview. If two or more answers still point toward autism, the screen is positive. If not, it's negative, and screening continues at future checkups.
• High likelihood (8–20): The screen is positive. The doctor can skip the Follow-Up and refer right away for a diagnostic evaluation and an early intervention evaluation.

What happens during the M-CHAT Follow-Up interview?

The checklist is built to catch as many autistic toddlers as possible, so it also flags some children who aren't autistic. The Follow-Up helps sort that out.

A doctor, nurse or trained staff member goes back over only the questions that scored and asks for specific, everyday examples of what your child does. Real examples are clearer than a yes or no on paper. If your child scored in the moderate range and nobody mentions the Follow-Up, it's fair to ask.

Does a positive M-CHAT mean my child has autism?

No. The M-CHAT is a screening tool, and the CDC notes that screening tools don't produce diagnoses; they flag children who need a closer look. Only a full autism evaluation by a qualified clinician can diagnose autism.

False positives are common. In the authors' research, roughly half of toddlers who still screened positive after the Follow-Up were later diagnosed with autism, and most of the others had another developmental delay or concern. That's why any child who screens positive should be evaluated.

False negatives happen too. A low score can miss some autistic children, especially when signs are subtle or appear later. If your gut says something isn't right, tell your doctor. You can ask for an evaluation regardless of the score.

Where can Minnesota families get a free autism screening?

For most families, autism screening costs nothing extra:

• Well-child visits: Marketplace plans and many other health plans generally cover autism screening at 18 and 24 months without a copay when you use an in-network provider.
• Child and Teen Checkups: For children on Medical Assistance or MinnesotaCare, checkups, including autism screening, cost the family nothing.
• Help Me Grow: Anyone can refer a child from birth to age 5 at helpmegrowmn.org for a free evaluation through the local school district, regardless of income.
• Follow Along Program and Early Childhood Screening: Local public health offers free developmental questionnaires for babies and toddlers, and school districts offer free Early Childhood Screening, ideally around age 3, required for children entering public kindergarten. Both look at general development, not autism specifically.

What should I do after a positive M-CHAT in Minnesota?

A positive screen can feel scary, but it's really a green light to get answers and support sooner. Most families work on several of these at once:

1. Talk with your child's doctor about the result. Ask for a referral for a diagnostic evaluation, and ask whether a hearing check makes sense.
2. Refer your child to Help Me Grow. You don't need a diagnosis or a doctor's order, and eligible children can start early intervention while you wait. Our Help Me Grow guide explains the process.
3. Get on more than one evaluation waitlist and ask about cancellations. Compare autism evaluation providers in Minnesota near you.
4. If you may want EIDBI autism therapy through Medical Assistance, ask whether the evaluation can also count as a CMDE. Here's how the CMDE works.
5. If your child isn't on Medical Assistance, look into MA-TEFRA, which can let children with certified disabilities qualify without counting their parents' income.
6. If talking is a concern, ask about a speech therapy evaluation now rather than waiting. Our late talker guide explains what to watch for.

What if my child is older than 30 months?

The M-CHAT-R was validated for 16 to 30 months. Based on studies with older children, its authors say it can be used up to 48 months. Doctors may also use other tools or refer directly for evaluation. Autism can be identified at any age.

If your child is under 5, you can still refer to Help Me Grow. For school-age children, send your district a written request for a special education evaluation — our IEP vs. 504 guide explains how school supports work. Ask your child's doctor about a medical evaluation too, since school and medical evaluations answer different questions.

Keep in mind

This article is general information, not medical advice, and a screening result isn't a diagnosis. Talk with your child's doctor about any concerns, and confirm current details with your clinic, your health plan, Help Me Grow or the Minnesota Department of Health.

You know your child best. If your concerns aren't taken seriously, it's okay to ask again or get a second opinion.