I recently wrote about the “severity level” specifier in the DSM-5-TR definition of autism (Levels 1, 2 and 3). This post looks at a different term that is starting to appear more often — “profound autism.”
The term “profound autism” was popularised in 2021 by the Lancet Commission. The aim was to help guide funding and support decisions, particularly for people with very high support needs. While the term is being used more in public discussions, it is not part of the DSM-5-TR diagnostic criteria and is not an official diagnosis.
In 2021, profound autism was described as including individuals who have:
- an IQ below 50 (where an “average” is 100 and Intellectual Disability broadly falls under 70)
- minimal to no functional (verbal?) language
- and the need for 24-hours supervision and assistance with daily living (precipitated by the child running away from caregivers, self-injurious harm and/or aggressive behaviours)
- and is used with individuals aged 8 years and over (younger than 8 is referred to as “at risk of profound autism”)
Children and adults who meet this profound description would almost always have very high support needs, meeting the level 3 severity descriptor.
But, Level 3 autism is broader than the profound definition. An individual can meet Level 3 when there functioinal difficulties are severe and disabling. For example, an individual may meet Level 3 severity who:
- Has some spoken language
- Experiences significant communication difficulties
- Does not meet criteria for intellectual disability
This means someone can be Level 3 without meeting criteria for “profound autism.” So within a “level” support needs can look very different.
Ultimately, terms like Level 3 or profound autism can provide a starting point — but individual needs, strengths, and supports should always guide decisions.
Reference: Hodge, M.A., Boulton, K.A., Sutherland, R. et al. Clinical Features of Children at Risk of Profound Autism. J Autism Dev Disord (2025). https://doi.org/10.1007/s10803-025-07160-9