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Autism Testing: Screening and Diagnosing Autism

Author: Warren Gouin

Last Updated

08 June 2023
Mum with her son in a Doctors office.

Autism is a complex neurodevelopmental disorder that affects social interaction, communication, and behaviour. According to the Centers for Disease Control and Prevention (CDC), 1 in 54 children in the United States is diagnosed with autism spectrum disorder (ASD). Early detection and intervention are crucial in improving outcomes for individuals with ASD. Therefore, screening and testing for autism are important tools in identifying and diagnosing the disorder.

Autism screening and testing involve a range of tools and tests that help clinicians identify autism symptoms and make a diagnosis. These tools and tests are designed to assess a person's communication skills, social interaction, behaviour, and developmental milestones. The screening and testing process is complex and involves multiple steps, including observation, interviews, and assessments.

In this article, we will explore the different types of autism screening and testing tools and tests used by clinicians to diagnose autism, as well as the importance of early detection and intervention for individuals with ASD.

Key Takeaways

  • Early detection and intervention are crucial for better outcomes in individuals with Autism Spectrum Disorder (ASD).
  • Several screening tools are available, including ASQ, STAT, M-CHAT, PEDS, and CSBS, which can aid in identifying and diagnosing ASD.
  • A formal diagnosis of ASD can help families access necessary support and services, while early identification can lead to early interventions, such as behavioural and communication therapies.
  • Challenges in screening and testing for ASD include lack of standardisation, variability of symptoms, and the need for trained professionals. To improve autism screening and testing, researchers should focus on developing superior tools and enhancing standardisation. Additionally, it is crucial to create support systems that aid individuals with ASD and their families throughout the screening and testing process and beyond.


Why testing for Autism is performed

Autism can be challenging to diagnose as it can present differently in each individual. Therefore, screening and testing for autism is essential to identify it early and provide the appropriate support to help the individual reach their full potential.

The primary purpose of screening and testing for autism is to identify early signs of the disorder to get the right support. Early diagnosis of autism can open doors for early intervention and treatment, leading to better outcomes for the individual. Autism testing can involve various healthcare professionals such as child psychologists, clinical psychologists, speech-language pathologists, and other health care providers.

A formal diagnosis of autism is essential because it can enable funding to become available to help cover the costs of support and treatments. However, unlike medical diseases that use the diagnosis to choose the cure, the diagnosis of autism does not enable access to cures. Instead, it directs how the person's symptoms are supported to improve their quality of life.

Screening can be helpful for parents and healthcare professionals to identify some of the early signs of autism. These include difficulty in social interaction, communication challenges, and repetitive behaviours. The symptoms of autism can vary in severity from person to person. Therefore, a formal evaluation is necessary to diagnose autism spectrum disorder correctly.

It is crucial to note that there is no known cure for autism spectrum disorder. However, with early diagnosis and support, individuals with autism can lead fulfilling lives, building critical social skills and adaptive skills necessary for their daily living.


Autism Screening Tools

Autism screening tools help identify individuals who may have autism spectrum disorder (ASD). Healthcare professionals use these tools to assess people who display signs of developmental or behavioural issues that may suggest ASD.

There are different types of screening tools that professionals use to diagnose autism. The Modified Checklist for Autism in Toddlers (M-CHAT) is one of them. It checks if children aged 16 to 30 months are at risk of having autism. The M-CHAT consists of 23 questions that assess social and communication skills, as well as behaviour.

Healthcare workers can utilise screening tools to assess if a child has cognitive, language, or motor skill delays. These tools supplement other assessments and evaluate the child's overall development. Additionally, these screening tools can identify children who may be at risk for developing autism in the future. Screening for autism aids in the diagnosis and support of individuals with ASD, leading to early intervention and tailored support for their unique needs.

If you have concerns about your child's development, talk to your healthcare provider about screening for autism. Early detection and intervention can make a big difference in your child's future.

Now let's explore some of the ASD screening methods.

Ages and Stages Questionnaire (ASQ).

The Ages and Stages Questionnaire (ASQ) is a screening tool that healthcare professionals may use to assess a child's development, including their risk for autism. ASQ is a set of questionnaires for parents or caregivers to answer about their child's development. It includes age-specific questions for children from birth to 66 months of age.

The ASQ includes questions that assess a child's communication, social, motor, and problem-solving skills. Screening for autism is included in the ASQ by evaluating behaviours such as eye contact, response to their name, and social interaction. If any potential developmental delays are identified, further evaluation may be recommended, including a formal diagnosis of autism.

ASQ is convenient for parents or caregivers to complete at home instead of going to a healthcare provider. This can help catch any potential delays or red flags early on, allowing for early intervention and support.

It is important to note that while the ASQ can identify potential risks for autism, it is not a diagnostic tool. A formal diagnosis of autism would be made through a comprehensive evaluation by a qualified healthcare professional, such as a clinical psychologist or speech-language pathologist.

Screening Tool for Autism in Toddlers and Young Children (STAT)

STAT helps identify autism in children aged 2 to 3 years old. STAT is a test that checks if a child has autism. It looks at their behaviour, communication, and social skills to see if there are any problems or delays that might show they could have autism.

The STAT assessment is performed by a qualified healthcare professional, such as a child psychologist, speech-language pathologist, or clinical psychologist. To assess the child, the child's behaviour and communication skills are observed while they play or engage in structured activities. Caregivers are asked specific questions about the child's developmental history and daily living skills.

STAT is usually used as a first screening tool for Autism Spectrum Disorder (ASD). A formal diagnostic evaluation is then done to give an official diagnosis. The assessment examines different areas of development, including social interaction, language skills, and repetitive behaviours, which are common in children with ASD. Children with ASD may also exhibit challenging or atypical behaviours, and the STAT helps identify patterns that signify the disorder.

The STAT assessment is a valuable tool for catching the early signs and symptoms of autism, which can lead to early intervention and treatment. Early intervention has been shown to improve outcomes for children with ASD by providing them with access to behaviour therapy and other support services that can enhance their social and adaptive skills.

Modified Checklist for Autism in Toddlers (M-CHAT)

The Modified Checklist for Autism in Toddlers (M-CHAT) is a widely used screening tool for Autism Spectrum Disorder (ASD) in young children between 16 and 30 months of age. This checklist helps to identify early signs of ASD, which is crucial for early intervention and treatment.

M-CHAT is a tool for caregivers to check a child's behaviour and find signs of Autism Spectrum Disorder. The checklist consists of 20 yes or no questions that cover various aspects of a child's behaviour such as joint attention, communication, play, and socialisation skills.

The M-CHAT is a reliable and valid screening tool that includes questions related to the characteristic behaviours of ASD. By answering these questions, parents can identify if their child is exhibiting any atypical behaviours that may be indicative of ASD.

If a child fails this screening, further diagnostic evaluations may be required to confirm an ASD diagnosis. A positive M-CHAT result doesn't mean a child has ASD. It shows signs that need more investigation by a healthcare professional.

Overall, the M-CHAT is a valuable tool for detecting early signs of ASD in toddlers, facilitating early intervention and treatment to improve outcomes for the child in the long term. Additionally, it can also be useful for raising awareness and understanding of ASD among parents and caregivers.

Parents’ Evaluation of Developmental Status (PEDS)

The Parents' Evaluation of Developmental Status (PEDS) is a tool used by healthcare professionals to assess the developmental status of children. It is a questionnaire completed by parents or caregivers that asks about various aspects of the child's development, including physical, cognitive, social, and emotional milestones.

The PEDS is designed to identify any potential developmental delays or concerns early on so that appropriate interventions can be put in place as soon as possible. It includes questions related to the child's language skills, social interactions, adaptive behaviours, and overall development.

The tool is beneficial as it allows healthcare professionals to gain insight into the child's developmental history and any potential risk factors that may be affecting their development. PEDS also helps healthcare professionals to identify children who may benefit from further screening or diagnostic evaluations.

Overall, the PEDS is a valuable tool in assessing a child's development and identifying any potential developmental delays or concerns early on. This can help ensure that appropriate interventions are put in place to support the child's development and improve their overall outcomes.

Communication and Symbolic Behavior Scales (CSBS)

The Communication and Symbolic Behavior Scales (CSBS) is a standardised assessment tool that is designed to evaluate communication and symbolic abilities in young children. Specifically, it focuses on assessing the development of functional communication, gestures, and symbolic play behaviours in children between the ages of 6 to 24 months.

The CSBS is administered by a trained healthcare professional, such as a speech-language pathologist or a clinical psychologist, and takes about 30 minutes to complete. It includes a series of structured activities and tasks that are designed to elicit various types of communicative and play behaviours from the child.

During the assessment, the healthcare professional observes the child's ability to communicate through vocalisations, gestures, and use of objects in play. CSBS assesses children's social skills, like eye contact and joint attention, which are significant for their communication and social progress.

CSBS helps identify communication and symbolic abilities and potential delays in development. Based on the assessment results, healthcare professionals can recommend appropriate interventions and strategies to support the child's communication and social development.

Overall, the CSBS is a valuable tool for healthcare professionals involved in the early identification and intervention of communication and language delays in young children.


How is Autism Diagnosed?

Diagnosing autism can be a complex process that involves various types of assessments and evaluations. The diagnostic criteria for ASD are outlined in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5).  According to the DSM-5, ASD is characterised by persistent deficits in social communication and social interaction across multiple contexts, as well as restricted, repetitive patterns of behaviour, interests, or activities.

To diagnose autism, healthcare professionals may use various formal evaluation tools and diagnostic tests. One such tool is the Autism Diagnostic Observation Schedule (ADOS), which is a standardised diagnostic assessment designed to measure social and communication behaviours in individuals suspected of having ASD. The ADOS typically involves a play-based observation of the individual's behaviour and interaction with the evaluator.

Another commonly used tool for diagnosing autism is the Autism Diagnostic Interview - Revised (ADI-R), which is a semi-structured interview conducted with the individual's parents or caregivers. The ADI-R is designed to collect information about the individual's early developmental history, communication and social interaction skills, and patterns of behaviour.

Healthcare professionals who can make a diagnosis of ASD include child psychologists, clinical psychologists, psychiatrists, and neuropsychologists. Speech-language pathologists and occupational therapists may also be involved in the diagnostic process and/or ongoing treatment of individuals with ASD. Overall, a comprehensive evaluation that includes multiple assessment tools and evaluations conducted by various healthcare professionals is often necessary to make an accurate diagnosis of ASD.


The Diagnostic and Statistical Manual of Mental Disorders (DSM)

The DSM is used by healthcare professionals to diagnose mental health conditions, including ASD. The DSM provides criteria based on observable symptoms and behaviours to aid in the diagnostic process.

The most recent edition of the DSM, the DSM-5, includes criteria that healthcare professionals use to diagnose ASD. The DSM-5 criteria for ASD involve two core areas: deficits in social communication and interaction, and restricted, repetitive patterns of behaviour, interests, or activities.

Deficits in social communication and interaction may include difficulties with social reciprocity, such as responding to social cues or initiating social interactions, challenges with nonverbal communication, and difficulties in developing and maintaining relationships.

Restricted, repetitive patterns of behaviour, interests, or activities may include stereotyped or repetitive motor movements, inflexible adherence to routines or rituals, highly focused interests, and sensory sensitivities.

In order for an individual to receive a formal diagnosis of ASD, the DSM-5 criteria must be met, and the individual must experience impairment in social, occupational, or other areas of functioning.

The DSM-5 serves as a standardised tool for healthcare professionals to diagnose ASD and other mental health disorders. It is important to note that the DSM-5 criteria should be used in conjunction with other diagnostic evaluations and assessments, such as the ADOS and ADI-R, to provide a comprehensive understanding of a patient's symptoms and behaviors.

What are the diagnostic Criteria for Autism?

The DSM-5 criteria provides healthcare professionals with specific guidelines for diagnosing Autism Spectrum Disorder (ASD). While it can be challenging to diagnose autism, especially in young children, the DSM-5 provides guidelines to assist professionals in making an accurate diagnosis.

The DSM-5 outlines two core areas that healthcare professionals should focus on when diagnosing ASD. These areas are deficits in social communication and interaction, as well as restricted, repetitive patterns of behaviour, interests, or activities.

Deficits in social communication and interaction may include challenges with social reciprocity. This means that individuals with ASD may have difficulty responding appropriately to social cues, initiating social interactions, and understanding social norms. They may also struggle with nonverbal communication, such as eye contact, facial expressions, and body language. Additionally, they may find it challenging to form and maintain relationships with others.

Restricted, repetitive patterns of behaviour, interests, or activities may also be present in individuals with ASD. This may include engaging in repetitive motor movements, such as hand-flapping or toe-walking. They may also have highly focused or intense interests and engage in repetitive or inflexible routines or rituals.

In order to be diagnosed with ASD, an individual must meet the DSM-5 criteria and exhibit impairment in social, occupational, or other areas of functioning. Symptoms vary and diagnoses may change over time as an individual develops.

In addition to the DSM-5 criteria, healthcare professionals will typically evaluate developmental history and perform various assessments to help diagnose ASD. These assessments may be completed by child psychologists, speech-language pathologists, or clinical psychologists, depending on the specific needs of the individual. Family history, environmental factors, and genetic factors may also be considered when making a diagnosis.



Autism screening and testing are crucial in identifying and diagnosing individuals with autism spectrum disorder (ASD). Early detection of ASD is essential for early intervention and support that can significantly improve an individual's quality of life.

Various screening tools are used to identify individuals who may have ASD, including the Modified Checklist for Autism in Toddlers (M-CHAT) and the Social Communication Questionnaire (SCQ). These tools assess various developmental areas, including language and social skills.

If an individual is suspected to have ASD, further testing and evaluation are necessary for a diagnosis. The standard diagnostic tool for ASD is the Autism Diagnostic Observation Schedule (ADOS), which assesses communication, social interaction, and play skills. In addition, other assessments, such as cognitive and developmental evaluations, may be conducted to provide a comprehensive diagnosis.

Autism screening and testing are critical in identifying and diagnosing individuals with ASD. Early detection and intervention can lead to significantly improved outcomes for individuals with ASD. Healthcare professionals must use appropriate screening tools and diagnostic assessments to provide accurate and comprehensive evaluations. Further research and development of screening and diagnostic tools are necessary to improve early detection and support for individuals with ASD.

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