Getting your child evaluated for autism starts with your pediatrician, who can refer you to a specialist for a formal diagnostic assessment. But there are also free pathways through your state’s early intervention program (for children under 3) and your local school district (for children 3 and older). The process typically involves a screening questionnaire, a referral, and then a comprehensive evaluation that can take several hours across one or more appointments.
About 1 in 31 children in the United States is now identified with autism, and the earlier a child is evaluated, the sooner they can access therapies that make a real difference. Here’s how the process works from start to finish.
Start With Your Pediatrician
The American Academy of Pediatrics recommends that all children be screened specifically for autism at their 18-month and 24-month well-child visits, regardless of whether a parent has concerns. If your child hasn’t had those screenings, or if you have concerns at any age, ask your pediatrician to do one.
The most common screening tool is a 20-item parent questionnaire called the M-CHAT-R. You answer yes-or-no questions about your child’s behavior, and each answer that suggests a possible concern earns one point. A score of 0 to 2 is considered low risk. A score of 3 to 7 is medium risk, and 8 to 20 is high risk. A medium- or high-risk score doesn’t mean your child is autistic. It means a more thorough evaluation is warranted.
Your pediatrician can then refer you to a specialist for a formal diagnostic evaluation. If your pediatrician is dismissive of your concerns, you’re within your rights to request the screening anyway or to seek a referral on your own.
Who Can Diagnose Autism
A formal autism diagnosis comes from a trained specialist, not a general pediatrician. The professionals qualified to make this diagnosis include developmental pediatricians, child psychologists, speech-language pathologists, and occupational therapists. Many evaluations involve a team of two or more of these specialists working together.
You’ll want to confirm that whoever evaluates your child has specific experience with autism assessments, not just a general background in child development. When calling to schedule, ask directly how many autism evaluations they perform and what tools they use.
What Happens During the Evaluation
A comprehensive autism evaluation looks at two core areas: how your child communicates and interacts socially, and whether they show restricted or repetitive patterns of behavior.
For the social communication piece, evaluators observe whether your child engages in back-and-forth conversation or play, uses and reads nonverbal cues like eye contact and gestures, and forms relationships with peers. For the behavioral piece, they look for things like repetitive movements or speech, rigid adherence to routines, unusually intense or narrow interests, and over- or under-reactions to sensory input (sounds, textures, lights, pain).
One of the most widely used evaluation tools is the ADOS-2, a structured assessment where a clinician engages your child in a series of activities designed to bring out natural social behaviors. Depending on your child’s age and language level, these activities might include building something together, playing with dolls, looking at picture books, having a pretend birthday party, blowing bubbles, sharing a snack, or talking about emotions and friendships. The evaluator isn’t testing whether your child “passes” or “fails” these tasks. They’re observing how your child communicates, plays, and responds in social situations.
Evaluations range widely in length, from 1 to 2 hours at some centers to over 8 hours at others. Some are completed in a single visit; others are spread across multiple appointments. You’ll also typically fill out detailed questionnaires about your child’s developmental history, daily behaviors, and milestones.
What the Diagnosis Requires
To receive an autism diagnosis under the current diagnostic manual, a child must show persistent difficulties in all three areas of social communication: social-emotional reciprocity, nonverbal communication, and developing relationships. They must also show at least two of four types of repetitive or restricted behaviors: repetitive movements or speech, inflexible routines, intensely focused interests, or unusual sensory reactions.
These symptoms need to have been present in early development, though they sometimes don’t become obvious until a child faces greater social demands at school or in group settings. Some children, particularly girls, develop strategies that mask their difficulties for years. The symptoms also need to meaningfully affect the child’s daily functioning.
Free Evaluations You’re Entitled To
You don’t have to go through a private specialist. Federal law provides two free evaluation pathways depending on your child’s age.
Children Under 3: Early Intervention
Every state runs an early intervention program under Part C of the Individuals with Disabilities Education Act. You can refer your child yourself without a doctor’s referral. Once a referral is made, the program is required by law to complete the initial evaluation, assessments, and a service plan within 45 days. This is a hard deadline with only two narrow exceptions: if the referral comes less than 45 days before the child’s third birthday, or if a parent doesn’t consent to the evaluation despite repeated attempts. Search “early intervention” plus your state’s name to find your local program.
Children 3 and Older: School District Evaluation
For children age 3 and up, you can request a free evaluation through your local public school district, even if your child isn’t yet enrolled. Submit your request in writing. The school is legally obligated to evaluate your child within a reasonable timeframe (which varies by state, typically 60 days). This evaluation is separate from a medical diagnosis and focuses on whether autism affects your child’s ability to learn and participate in school.
Medical Diagnosis vs. School Eligibility
This is a distinction that catches many parents off guard: a medical diagnosis of autism does not automatically entitle your child to special education services. These are two separate systems with different standards.
A medical diagnosis is made by a clinician using the criteria in the diagnostic manual. In the medical system, a diagnosis alone is generally enough to begin treatment, including behavior therapy, speech therapy, occupational therapy, and other interventions. A school eligibility determination, by contrast, is made by a team of school professionals and parents. They must find not only that your child meets the definition of autism (which varies by state) but also that the autism interferes with learning and that the child needs special services to make academic progress. It is entirely possible, and not uncommon, for a child to have a medical autism diagnosis but not qualify for special education.
If your child needs both clinical therapies and school supports, you may want to pursue both tracks. A medical diagnosis can also help with insurance coverage for private therapies that schools don’t provide.
Wait Times and Costs
Long wait times are one of the biggest obstacles families face. A federal survey of autism centers found that nearly two-thirds had wait times longer than four months. About 15% reported waits of over a year, and some had stopped accepting new patients entirely.
To shorten your wait, consider getting on multiple waitlists simultaneously. Ask your pediatrician for several referrals. Check whether your children’s hospital has a diagnostic clinic with a separate waitlist from individual specialists. University-affiliated programs sometimes offer evaluations conducted by supervised trainees at lower cost and shorter waits.
Cost is the other major barrier. A comprehensive private evaluation by a multidisciplinary team typically runs $2,500 to $5,000 out of pocket. Many insurance plans cover diagnostic evaluations for autism, but coverage varies widely. Call your insurer before scheduling and ask specifically about autism diagnostic testing, not just “neuropsychological testing,” since coverage rules can differ. The free options through early intervention and school districts exist precisely because these private costs are prohibitive for many families.
What to Do While You Wait
A long wait for a diagnostic evaluation doesn’t mean your child has to wait for all support. Early intervention programs can begin services based on developmental delay alone, without a formal autism diagnosis. Speech therapy and occupational therapy can often be started with a pediatrician’s referral and insurance authorization, independent of a diagnostic evaluation. Some behavioral health providers will begin parent coaching or skills-based therapy while a formal assessment is pending.
Document what you’re seeing at home. Keep notes on specific behaviors, when they started, how often they occur, and what seems to trigger them. Video clips of concerning behaviors are especially useful, because children don’t always display the same behaviors in a clinical setting that they do at home. Bringing this documentation to your evaluation appointment gives the specialist a much fuller picture and can make the assessment more accurate.