What Happens During an Autism Evaluation: A Step-by-Step Guide for Families

This article is Part III of our series on understanding autism evaluation.
In Part I, we discussed where families often begin when concerns about autism arise. In Part II, we explored early developmental differences that parents often notice first.

• Part I: Where to Start If You Think Your Child – or You – May Be on the Autism Spectrum
• Part II: Understanding Autism Evaluation, Part II: Early Signs of Autism in Toddlers and Young Children

In this article, we will walk through what happens during a comprehensive autism evaluation and how clinicians gather the information needed to determine whether a child meets diagnostic criteria for autism spectrum disorder.

Step 1: Initial Clinical Interview

The evaluation process usually begins with a detailed clinical interview with parents or caregivers.

During this conversation, clinicians gather information about:

• pregnancy and birth history
• early developmental milestones
• speech and language development
• social interaction patterns
• play behaviors
• sensory sensitivities
• behavioral or emotional concerns
• family history of developmental or mental health conditions

Parents are often asked to describe when they first noticed developmental differences and how those patterns have changed over time.

Developmental history is one of the most important components of autism assessment because autism is defined as a neurodevelopmental condition that begins in early childhood.

Step 2: Behavioral Observation

Clinicians also spend time observing the child’s behavior and interaction style.

Observation may include looking at:

• eye contact and social engagement
• communication styleplay behaviors
• response to social cues
• repetitive behaviors or movements
• flexibility in routines or activities

These observations help clinicians understand how a child interacts in real time and whether patterns are consistent with autism characteristics.

Step 3: Standardized Questionnaires and Rating Scales

Many evaluations include validated assessment tools completed by parents, caregivers, or teachers. These tools help gather structured information about social communication and daily functioning.

Commonly used measures may include:

• SRS-2 (Social Responsiveness Scale)
• SCQ (Social Communication Questionnaire)
• ABAS-3 (Adaptive Behavior Assessment System)
• other developmental or behavioral screening tools

These measures provide additional data that help clinicians understand how a child functions across different environments such as home and school.

Step 4: Structured Autism Assessments (When Needed)

In some cases, clinicians may recommend a structured autism assessment such as the ADOS-2 (Autism Diagnostic Observation Schedule, Second Edition).

The ADOS-2 is a standardized observational assessment designed to evaluate:

• social communication
• social interaction
• play and imagination
• restricted or repetitive behaviors

During the assessment, the clinician engages the child in a series of structured activities and social interactions that allow them to observe communication and behavior patterns.

It is important to note that no single test alone determines an autism diagnosis. The ADOS-2 is one component of a broader evaluation that also includes developmental history and clinical observation.

Step 5: Evaluation of Other Developmental Factors

Because autism often occurs alongside other conditions, clinicians may also evaluate areas such as:

• attention and executive functioning
  • anxiety or emotional regulation
  • learning differences
  • language development
  • adaptive daily living skills

Some children may also receive psychological or neuropsychological testing to better understand cognitive strengths and learning profiles.

This broader evaluation helps determine whether additional conditions, such as ADHD or learning differences, may also be present.

Step 6: Diagnostic Review Using DSM-5-TR Criteria

After gathering information from interviews, observations, and assessment tools, clinicians review the findings using DSM-5-TR diagnostic criteria for autism spectrum disorder.

These criteria focus on two core domains:

1. Persistent differences in social communication and social interaction

1. Restricted or repetitive patterns of behavior, interests, or activities

Clinicians also consider whether these characteristics:

• began during early development
• affect daily functioning
• cannot be better explained by another condition

Step 7: Feedback and Next Steps

The final step in the evaluation process is feedback with the family.

During this discussion, clinicians review:

• the results of the assessment
  • whether diagnostic criteria are met
  • the child’s developmental strengths
  • areas where support may be helpful
  • recommendations for services or interventions

Even when a child does not meet full criteria for autism, the evaluation may still identify important developmental needs that can benefit from support.

Why the Evaluation Process Matters

Autism evaluations are designed to provide clarity and guidance, not simply a label.

A thorough assessment helps families understand:

• How their child learns and communicates
• what types of support may improve daily functioning
• Which therapies or educational strategies may be helpful

When families understand a child’s developmental profile, they are better able to advocate for appropriate resources and support.

Common Questions About Autism Evaluations

How long does an autism evaluation take?

The process can vary depending on the setting and the child’s needs. Some evaluations occur over several appointments and may include interviews, questionnaires, and structured assessments.

Who performs autism evaluations?

Autism evaluations may be conducted by professionals with specialized training, including psychiatrists, psychologists, neuropsychologists, or developmental pediatricians.

Does every child need the ADOS test?

Not always. While the ADOS-2 is a well-validated assessment tool, clinicians typically combine multiple sources of information, including developmental history and clinical observation, to determine whether diagnostic criteria are met.

This article is part of our series on understanding autism evaluation.

In the next post, we’ll discuss the role of the ADOS-2 assessment and how clinicians decide when it may be helpful as part of the diagnostic process.

References

American Academy of Pediatrics. (2020). Identification, Evaluation, and Management of Children With Autism Spectrum Disorder.

American Psychiatric Association. (2022). Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR).

Lord C., Rutter M., DiLavore P., et al. Autism Diagnostic Observation Schedule, Second Edition (ADOS-2).

Lai MC, Lombardo MV, Baron-Cohen S. (2019). Autism. The Lancet.