How Is Autism Diagnosed?

May 27, 2021

Screening & Assessment of Autism?

How Is Autism Diagnosed? 

Over the past decade, many pediatricians have begun screening children for autism during checkups. As a result, many young children exhibiting early signs of autism are receiving referrals for appropriate assessment. Those children who eventually receive an autism diagnosis are often prescribed speech and behavior therapy, medical guidance, and other supports that can improve their quality of life and their prognosis. Research has shown that intervening as early as possible is associated with more positive outcomes than treatment later in life or not at all.

Different Tests In Which Autism Is Diagnosed

Autism screening is usually administered by a pediatrician during a routine well-child checkup. The doctor may observe the child or ask you questions about his or her behaviors at home and while interacting with other children on the playground. The purpose of an autism screening is to identify common early signs of autism. The following are early signs of autism, however, they do not necessarily need to be present.

  • Delays in communicating with others including speech and gestures 
  • Not responding to one’s own name
  • Getting upset over minor changes in routine
  • Avoiding many, if not most, forms of physical contact
  • Showing little interest in objects or people

The American Academy of Pediatrics (AAP) suggests that autism screenings should be part of standard 18 and 24-month well-child checkups, whereas the National Center of Birth Defects and Developmental Disabilities (NCBDD) recommends that all children be screened at either 9, 18, and 24 or 30 months.  Screenings administered during well-child checkups are only designed to indicate whether a child may be showing some early signs of autism. These screenings identify areas requiring further assessment and do not replace a formal diagnosis. Although many doctors follow the AAP and NCBDD guidelines, parents should also be proactive. If you suspect your child may have autism,  please ask your child’s pediatrician to administer screening or request a referral to a qualified specialist. 

Autism Test 

Physicians use an array of formal and informal autism screening tools. These can range from simple observations to formal assessments. Some of the more commonly used autism screening tools are: 

  • Modified Checklist for Autism in Toddlers, Revised (M-CHAT), is a popular 20-question test designed for toddlers between 16 and 30 months old. Note: there is recent evidence that the M-CHAT may not be as effective in screening females and minority, urban and low-income children
  • The Ages and Stages Questionnaire (ASQ) is a general developmental screening tool that examines developmental challenges at specific ages. 
  • Screening Tool for Autism in Toddlers and Young Children (STAT) is an interactive screening tool comprising of twelve activities that assess play, communication, and imitation. 
  • Parents' Evaluation of Developmental Status (PEDS) is a general developmental parent interview designed to identify delays in motor, language, self-help, and more. 

If the results of an autism screening indicate that your child shows some signs of autism, your pediatrician will likely refer you to a specialist for a formal evaluation. 

Receiving An Autism Diagnosis 

Only a specialist can make an official diagnosis of autism There are two important reasons to obtain a formal diagnosis for your child. First, your child may be eligible for support and resources from government and insurance agencies. Second, there are other related conditions that are also associated with autism, but involve different treatments, such as Sensory Processing Disorder as well as Fragile X, Landau-Kleffner, and Rett’s syndromes. An autism diagnosis is usually based on the criteria described in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) which is published by the American Psychiatric Association and used by most healthcare professionals. 

The DSM-5 recognizes two broad diagnostic criteria for autism: 

  1. Persistent deficits in social communication and social interaction
  2. Restricted and repetitive patterns of behavior, interest, or activities. 

These symptoms often appear early in life and can disrupt the child’s social, emotional, and cognitive development. After a  diagnosis of autism, a specialist will coordinate a healthcare team to assess and recommend treatment.

Ongoing Testing For Autism 

Your child’s school district and/or clinician may perform a Functional Behavioral Assessment. This evaluation seeks to determine causes for specific, often challenging, behaviors. Based primarily on observations in various settings, strategic intervention(s) are developed to address these behaviors. Other assessments may include interviews with parents and teachers and completing behavioral and sensory rating scales.

It is recommended that families, educators, and pediatricians track their child’s progress over time. Regular assessments help guide treatment choices throughout the entire lifetime. The Autism Treatment Evaluation Checklist (ATEC), a frequently used, no-cost, online tool developed to monitor symptoms and behaviors and assess the effectiveness of various treatments over time. The following webinar is the first in a two-part series about the importance of ongoing assessment and evaluation for children with symptoms of autism. 

How Is Autism Diagnosed Summary

Early childhood screening for autism is essential for all children and early intervention can have a tremendous impact on prognosis and there are many different types of screening tools that can be used to help give an accurate diagnosis. Autism screening is usually administered by a pediatrician during a routine well-child checkup. The doctor may observe the child or ask you questions about his or her behaviors at home and while interacting with other children on the playground. The purpose of an autism screening is to identify common early signs of autism. 

Different Types of Autism Tests

Physicians use an array of formal and informal autism screening tools. These can range from simple observations to formal assessments. This includes: 

  • Modified Checklist for Autism in Toddlers, Revised (M-CHAT), is a popular 20-question test designed for toddlers between 16 and 30 months old. Note: there is recent evidence that the M-CHAT may not be as effective in screening females and minority, urban and low-income children
  • The Ages and Stages Questionnaire (ASQ) is a general developmental screening tool that examines developmental challenges at specific ages. 
  • Screening Tool for Autism in Toddlers and Young Children (STAT) is an interactive screening tool comprising of twelve activities that assess play, communication, and imitation. 
  • Parents' Evaluation of Developmental Status (PEDS) is a general developmental parent interview designed to identify delays in motor, language, self-help, and more. 

Receiving An Autism Diagnosis 

Only a specialist can make an official diagnosis of autism. An autism diagnosis is usually based on the criteria described in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) which is published by the American Psychiatric Association and used by most healthcare professionals. 

The DSM-5 recognizes two broad diagnostic criteria for autism: 

  1. Persistent deficits in social communication and social interaction
  2. Restricted and repetitive patterns of behavior, interest, or activities. 

These symptoms often appear early in life and can disrupt the child’s social, emotional, and cognitive development. After a  diagnosis of autism, a specialist will coordinate a healthcare team to assess and recommend treatment.

Autism Spectrum Disorder Support Supplement 

How Is Autism Diagnosed

A child's brain rapidly develops between the ages of 3 and 5 years old. Majority of the structure and building blocks of the brain are present by age 9. The prefrontal lobe is the last to develop and this usually occurs in adolescence. The prefrontal lobe is involved in a variety of complex behaviors including planning, and greatly contributes to personality development. Spectrum + is advanced autism spectrum disorder support designed to provide and support the nutrition shown to be deficient in children with autism.



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