While differing levels of ASD that indicate severity can be very helpful for those who want to understand ASD better, it is important to remember that it does not completely capture the traits and lived experiences of everyone who is autistic.

When diagnosed with ASD, one is further classified as level 1, 2, or 3. These classifications correspond with severity of symptoms and dependency, particularly indicating how much support is necessary for that individual’s daily functioning. 

- ASD Level 1
- ASD Level 2
- ASD Level 3
- Limitations of the ASD Levels

Three Functional Levels of ASD

The mildest form, this classification is often referred to as high-functioning. These individuals require the least amount of support, and usually can speak fluently and function reasonably well. Before the DSM-5, this is where Asperger’s Syndrome fell. 

ASD Level 1

Individuals in this group may have more apparent problems with communication and find it harder to change tasks and routine. Some of these communication problems can display as short, simple sentences. These individuals require a fair amount of support.

ASD Level 2

As the highest level and most severe form of autism, ASD level 3 individuals require substantial support. Manifested behaviors may be similar to levels 1 and 2, but the degree is much higher. Ability to speak may be very limited, and social functioning extremely inhibited. 

ASD Level 3

Though helpful in indicating where someone’s functionality lies on a scale, it is subjective and restricting. Borderline cases are difficult to classify, and where these border lines are is not clear. Type of support is not clear either. Every individual on the Autism spectrum is unique, with unique circumstances and symptoms, so types and amount of support will vary. As an individual develops and grows, they may even change to a different level, so position is not stable. 

Limitations of ASD Levels

Limitations of the ASD Levels

Rudy, L. J. (2020, December 17). Making Sense of the Three Levels of Autism. Verywell Health. https://www.verywellhealth.com/what-are-the-three-levels-of-autism-260233

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