Getting your child evaluated for autism starts with your pediatrician, who can perform an initial screening and refer you to a specialist for a full diagnostic evaluation. The process typically involves two stages: a brief screening questionnaire at your child’s regular checkup, followed by a comprehensive assessment with a trained team if concerns are flagged. About 1 in 31 children in the U.S. are now identified with autism spectrum disorder, so the evaluation pathway is well established, though wait times can be long.
Signs That Prompt an Evaluation
You may already have a gut feeling that something is different about your child’s development. The CDC identifies specific behavioral markers at different ages that can guide your thinking. By 9 months, most children respond to their name and show facial expressions like happiness, sadness, or surprise. By 12 months, they typically play interactive games like pat-a-cake and use gestures like waving goodbye. By 15 months, children usually share interests with others, like showing you a toy they enjoy, and by 18 months, they point at things to get your attention.
In toddlerhood and beyond, the signs shift. A child who doesn’t notice when others are hurt or upset by age 2, doesn’t join other children in play by age 3, or doesn’t engage in pretend play (like pretending to be a superhero or teacher) by age 4 may benefit from an evaluation. These aren’t checklists where every item must apply. Some children show only a few of these signs, or show them subtly. If you’re noticing patterns that concern you, that’s reason enough to bring it up with your child’s doctor.
Step 1: The Pediatrician Screening
The American Academy of Pediatrics recommends that all children be screened for autism at their 18- and/or 24-month well-child visits, regardless of whether parents have concerns. The most common tool is the Modified Checklist for Autism in Toddlers, or M-CHAT, which is designed for children between 16 and 30 months. It’s a short parent questionnaire, not a diagnostic test.
If your child scores above a certain threshold (a total score of 3 or a score of 2 on specific high-priority items), the pediatrician will do a follow-up interview to clarify the results. Children who screen positive on both the questionnaire and the follow-up should be referred for a full diagnostic evaluation. If your child is older than 30 months or you have concerns between scheduled visits, you don’t need to wait for the next checkup. Call your pediatrician and ask directly for a developmental screening or a referral to a specialist.
Step 2: The Diagnostic Evaluation
A full autism evaluation is more involved than a screening. It’s typically conducted by a team that includes a child psychologist, a developmental and behavioral pediatrician, and often a speech-language pathologist. Some families see these professionals at a hospital-based autism center; others work with a private practice psychologist who specializes in autism assessments.
The gold-standard tool used in many evaluations is the ADOS-2 (Autism Diagnostic Observation Schedule). It comes in five modules tailored to different ages and language levels, from nonverbal toddlers to verbally fluent adults. During the assessment, a trained examiner uses specific activities and materials to create social situations, both structured and open-ended, and observes how your child responds. The examiner rates your child’s social interaction, communication, and behavior, then compares scores against established cutoff points.
The ADOS-2 is typically paired with a parent interview called the ADI-R, where you’ll be asked detailed questions about your child’s developmental history, social behavior, communication patterns, and any repetitive behaviors or intense interests. This combination matters because the observational test alone doesn’t capture the full picture. It doesn’t account for repetitive behaviors or how your child acts in everyday life outside a clinical setting. Evaluations range from 1 to 2 hours at some centers to over 8 hours at others, depending on the thoroughness of the assessment and your child’s age.
What Clinicians Are Looking For
A formal diagnosis requires that a child meet criteria in two areas. First, they must show persistent difficulties in all three aspects of social communication: back-and-forth social interaction (like conversational give-and-take), nonverbal communication (eye contact, gestures, facial expressions), and developing and maintaining relationships with others.
Second, they must show at least two of four types of restricted or repetitive patterns. These include repetitive movements or speech (like lining up toys, echoing phrases), strong insistence on routines or sameness (extreme distress at small changes, rigid thinking), intensely focused interests that are unusual in their depth or subject, and unusual reactions to sensory input (such as indifference to pain, strong aversion to certain sounds or textures, or fascination with lights or movement). These patterns must be present in early development, though they may not become fully obvious until social demands increase, like starting preschool.
Expect Long Wait Times
This is the hardest part for many families. A national survey of autism centers found that nearly two-thirds had wait times longer than four months. The breakdown: about 13% of centers could see families within four weeks, 25% within one to three months, and 31% within four to six months. But 15% reported waits of seven to eleven months, 14% had waits over a year, and 3% had stopped accepting new referrals entirely because their waitlists were too long.
While you wait, there are things you can do. Ask to be placed on cancellation lists at multiple centers. Look into whether your state’s early intervention program (for children under 3) or your school district (for children 3 and older) can begin providing services before a formal diagnosis is complete. Some families also pursue telehealth-based evaluations, which have become more widely available and can sometimes offer shorter wait times.
School Evaluations vs. Medical Diagnoses
You have two separate pathways available, and they serve different purposes. A medical diagnosis is made by a doctor or psychologist using the criteria in the DSM-5. That diagnosis alone is typically enough to access therapeutic services like behavioral therapy, speech therapy, and occupational therapy through your insurance or medical providers.
A school-based evaluation, on the other hand, determines whether your child qualifies for special education services under federal law (IDEA). Autism is one of 14 disability categories schools recognize, but the definition varies by state, and there’s an additional requirement: the school team must determine that autism symptoms specifically interfere with your child’s learning and that they need special services to make academic progress. Because of this extra hurdle, it’s not uncommon for a child to have a medical diagnosis of autism but still be found ineligible for special education services.
These two systems don’t automatically talk to each other. A medical diagnosis doesn’t guarantee school services, and a school eligibility determination isn’t the same as a clinical diagnosis. Many families pursue both. You can request a school evaluation in writing at any time, and the school district is legally required to respond. This process is free and can run in parallel with a private medical evaluation.
Insurance Coverage for Evaluations
Most states now have laws requiring private health insurers to cover the screening, diagnosis, and treatment of autism spectrum disorder. The specifics vary significantly by state. Some laws cap coverage at certain ages (often 18 or 21), limit annual visits, or set spending caps. States like Alabama, Alaska, Colorado, and Delaware are among those with explicit mandates covering diagnosis.
Before scheduling an evaluation, call your insurance company and ask specifically whether developmental or neuropsychological testing for autism is covered, whether you need a referral or prior authorization, and which providers in your area are in-network. If your child is under 3 and you go through your state’s early intervention system, evaluations are provided at no cost to families. For children 3 and older, school-based evaluations through your local district are also free.
If Your Child Is Older
Most screening tools and public awareness focus on toddlers, but autism can be identified at any age. Children who are verbal, academically capable, or who mask their difficulties in social settings are often missed in early childhood. Girls, in particular, tend to be diagnosed later than boys. If your child is school-age or older and you suspect autism, the process is the same: start with your pediatrician or go directly to a psychologist or developmental specialist who evaluates older children. The assessment tools and interview questions are adjusted for age, but the core diagnostic criteria remain the same.