Getting your child evaluated for autism starts with your pediatrician, who can perform an initial screening and refer you to a specialist for a formal diagnosis. The process typically involves two stages: a brief screening questionnaire at your child’s regular checkup, followed by a more in-depth evaluation with a trained specialist if concerns are flagged. Knowing what to expect at each step can help you move through the process faster and avoid common delays.
Start With Your Pediatrician
Pediatricians routinely screen for autism at the 18-month and 24-month well-child visits using a tool called the M-CHAT-R, which is designed for toddlers between 16 and 30 months old. It’s a 20-question checklist you fill out in the waiting room, and the results fall into three risk categories.
Children who score 0 to 2 are considered low-risk, though if they’re younger than 24 months, the screening is repeated after their second birthday. A score of 3 to 7 is medium-risk, which triggers a follow-up questionnaire. If concerns remain after that second round, a referral for diagnostic evaluation is recommended. Children who score 8 to 20 are considered high-risk and can be referred immediately to a specialist without the follow-up step.
If your child is older than 30 months or you have concerns between scheduled checkups, you don’t need to wait. Call your pediatrician and describe the specific behaviors you’re noticing. Pediatricians can make referrals at any age.
Who Can Diagnose Autism
A formal autism diagnosis comes from a trained specialist, not from a screening at a regular checkup. The professionals qualified to evaluate and diagnose include developmental pediatricians, child psychologists, neuropsychologists, speech-language pathologists, and occupational therapists. In many cases, a team of two or more of these specialists works together to assess your child from different angles.
You can ask your pediatrician for a referral to a specific specialist, or you can contact a diagnostic center directly. Children’s hospitals and university-affiliated autism centers are common options. Some families pursue a private practice evaluation at the same time they’re on a waitlist at a larger center, since wait times can be significant.
What Happens During the Evaluation
The gold-standard evaluation tool is the ADOS-2 (Autism Diagnostic Observation Schedule), a structured 40- to 60-minute session where a clinician interacts directly with your child. Five different versions of the test exist, matched to your child’s age and language level, covering toddlers through verbally fluent older children. During the session, the examiner uses specific toys, activities, and conversation prompts to create natural social situations and then observes how your child responds, both spontaneously and when prompted. The clinician rates your child’s social engagement, communication, eye contact, body language, and repetitive behaviors.
The ADOS-2 is often paired with a structured parent interview called the ADI-R, where a clinician asks you detailed questions about your child’s developmental history and current behavior. The full evaluation, including both tools plus any cognitive or language testing, can range from 1 to 2 hours at some centers to over 8 hours at others, sometimes split across multiple appointments.
What Clinicians Are Looking For
To receive an autism diagnosis, a child must show persistent difficulties in all three areas of social communication: back-and-forth social interaction (like responding when someone talks to them or sharing interests), nonverbal communication (like eye contact, gestures, and facial expressions), and building and maintaining relationships with peers.
On top of that, the child must also show at least two of the following four patterns: repetitive movements or speech (like lining up toys or echoing phrases), strong insistence on routines or extreme distress at small changes, intensely focused interests that are unusual in their intensity, and over- or under-reactions to sensory input like sounds, textures, or lights. These behaviors need to be present early in development, though they may not fully show up until social demands exceed the child’s ability to cope.
If a diagnosis is made, the clinician assigns a severity level. Level 1 means the child requires support, Level 2 means substantial support, and Level 3 means very substantial support. This level is based on the degree of difficulty in social communication and the intensity of repetitive behaviors.
Expect a Wait
Wait times for a diagnostic evaluation are one of the biggest frustrations parents face. A federal survey of autism centers found that nearly two-thirds had wait times longer than four months. About 31% of centers reported waits of 4 to 6 months, 15% reported 7 to 11 months, and another 15% reported waits of over a year. Three percent of centers had stopped accepting new referrals entirely because their waitlists were full.
To shorten your wait, consider getting on multiple waitlists at once. Ask your pediatrician for several referral options, including private practices, hospital-based clinics, and university programs. Some telehealth-based evaluations have shorter wait times, though availability varies by state. If your child is under 3, don’t wait for the diagnostic evaluation to request early intervention services, since they operate on a separate, faster timeline.
For Children Under 3: Early Intervention
If your child is under 3 and you have developmental concerns, you can request a free evaluation through your state’s Early Intervention program (Part C of the federal IDEA law) without waiting for a medical diagnosis. You do not need a doctor’s referral. Parents are considered a primary referral source, and anyone, including a grandparent, daycare provider, or friend, can make a referral on a child’s behalf.
To find your local program, ask your pediatrician, contact the neonatal unit at your local hospital, or visit the Early Childhood Technical Assistance Center (ECTA) website, which lists Part C coordinators for every state. Once you make the request, the program is required to evaluate your child and, if eligible, begin services. These services often include speech therapy and occupational therapy provided in your home or daycare at no cost to you.
Medical Diagnosis vs. School Evaluation
This is a distinction that catches many parents off guard. A medical diagnosis and a school district evaluation are two separate processes with different purposes, and one does not automatically guarantee the other.
A medical diagnosis is made by a doctor or specialist using the clinical criteria described above. It qualifies your child for medically prescribed therapies covered by insurance. A school evaluation, on the other hand, is conducted by a team of school professionals along with parents. Its purpose is to determine whether your child’s autism symptoms interfere with learning enough to qualify for special education services under an IEP (Individualized Education Program).
Here’s the key difference: the school team must find both that your child has a qualifying disability and that they need special services to make academic progress. Because of this extra requirement, it is not uncommon for a child with a medical autism diagnosis to be found ineligible for special education. The reverse is also possible. The definition of autism used by school districts varies from state to state, with some following the medical definition and others using their own criteria. Pursuing both a medical evaluation and a school evaluation gives your child the broadest access to support.
For Children 3 and Older: School District Services
Once your child turns 3, the school district becomes responsible for evaluating them and providing services if they qualify. You can request an evaluation in writing from your local school district even if your child isn’t yet enrolled. The district is legally required to evaluate at no cost to you. Children between 3 and 5 may be eligible for a developmental preschool program that provides extra support. Older children who qualify receive services through an IEP.
Paying for a Private Evaluation
Most private insurance plans cover autism diagnostic evaluations when developmental delays or persistent difficulties with social communication have been identified. Covered services typically include the autism-specific developmental evaluation, cognitive and adaptive behavior testing, speech and language assessments, and hearing evaluations. However, testing performed in school settings is generally excluded from insurance coverage.
Before scheduling, call your insurance company to ask whether prior authorization is required and whether the specific provider you’ve chosen is in-network. Some plans require a referral from your pediatrician. Out-of-pocket costs for a private evaluation without insurance can range from several hundred to several thousand dollars depending on the provider and the scope of testing.
What Comes After a Diagnosis
Every diagnostic report includes a section with specific recommendations for your child. Ask for a copy of the full report and review those recommendations with your pediatrician, who can help you with therapy referrals and connect you to community resources. Common next steps include speech therapy to build communication skills and occupational therapy to support daily living skills like dressing, eating, and managing sensory sensitivities.
For children under 3, the next step is a referral to your state’s Early Intervention program if you aren’t already connected. For children 3 and older, contact your local school district to begin the process of evaluating your child for special education eligibility. Many families pursue both medical therapies and school-based services at the same time, since they address different needs and operate independently of each other.