Autism Screening vs. Autism Assessment: What’s the Difference?

If you’re wondering if your child has autism, you may have come across some free autism screeners online. Many parents wonder what the difference is between autism screening and a full autism assessment. 

Typically, an autism assessment is going to be more in depth than autism screening. Autism screening is generally a good first step for parents who are curious about autism for their child (or even for themselves). Screening tools tend to be more brief than full assessments. They are designed to flag concerns which may warrant further evaluation. The results of the screening tool may recommend further testing (autism assessment) to fully evaluate whether your child meets the criteria for an autism diagnosis. It may be helpful to think of screening as a quick snapshot, whereas an autism assessment gives you a full picture. Sometimes, a quick snapshot may be all you need. 

What Kinds of Screening Tools Are Used?

There are different types of screening tools. Some screening tools are more specifically focused on autism, such as the Modified Checklist for Autism in Toddlers (M-CHAT) (Robins et al., 2009), while others may focus more on general development, such as the Ages and Stages Questionnaire (ASQ) (Paul H. Brookes Publishing Co., 2026). Some screening tools are free for parents to access online, while others are designed to be scored by professionals, such as pediatricians or early childhood educators. 

Will My Child Automatically Receive Screening for Autism?

The American Academy of Pediatrics (AAP) recommends that every child receives screening for autism during their well-child doctor visits at both 18 months and 24 months old (Centers for Disease Control and Prevention, 2025).  It may be helpful to have a conversation with your child’s pediatrician specifically about autism screening to ensure they are completing the screening with all of your observations and concerns in mind in addition to their own observations. 

Are Screening Tools 100% Accurate?

Unfortunately, no. No tool is going to be 100% accurate. There can be things that are missed or just not fully captured with a screening tool. At the end of the day, you know your child best. Even if the results of a screening tool do not indicate that autism is likely, it is still recommended that you talk about your concerns with your child’s pediatrician and seek out an autism assessment if you are still concerned. 

What is an Autism Assessment?

An autism assessment is typically completed by a medical or mental health professional. It generally includes data from a combination of standardized tests (which may include some screening tools) as well as interviews with parents and others who know your child (e.g., teachers, therapists, etc.). 

There are both comprehensive autism assessments and focused autism assessments. A focused assessment is generally more focused specifically on autism and whether or not the child meets the criteria for a diagnosis. Comprehensive assessments typically include additional types of testing (e.g., cognitive, memory, executive functioning) to get a better understanding of how the child’s brain processes information and determine if there are any other diagnoses that may fit, such as ADHD or a learning disorder. 

Which One Should I Choose?

It can be helpful to start with a screening tool for your child. And while it is recommended that all children be screened for autism at 18 months old and 24 months old, some children may not show clear signs of autism until they are older. For example, some parents start to really see concerns when their child starts kindergarten, and the child is interacting with same-age peers on a daily basis. It may be appropriate at that point to consider additional screening or an autism assessment. 

If you need a medical diagnosis to receive services for your child, you will likely need an autism assessment. Your insurance may require a full comprehensive assessment in order to qualify for services, so it is important to know which type of assessment the clinician provides (i.e., comprehensive vs focused autism assessment). An autism assessment can also be helpful to provide documentation when requesting accommodations. 

The ultimate goal of both screening and assessment is the same: to better understand your child and ensure they can access any services which may be helpful for their development. 

References

Centers for Disease Control and Prevention. (2025, April 15). Clinical screening for autism spectrum disorder. U.S.

Department of Health and Human Services. https://www.cdc.gov/autism/hcp/diagnosis/screening.html

Paul H. Brookes Publishing Co. (2026). Ages & Stages Questionnaires (ASQ). https://agesandstages.com/

Robins, D. L., Fein, D., & Barton, M. (2009). The Modified Checklist for Autism in Toddlers, Revised with Follow-Up (M-

CHAT-R/F). M-CHAT. mchatscreen.com