Self-identifying as Autistic: is it valid without a diagnosis?

Why self-identification is a valid starting point

Many Autistic people identify as Autistic without a formal diagnosis, and this is contested in some professional circles. The argument for treating it as valid is straightforward. Diagnostic access is unequal. It depends on where you live, on money, on being able to navigate referral systems, and on whether your presentation matches criteria developed mostly from studies of white boys (Lai & Baron-Cohen, 2015). UK waiting times often exceed two years, and in some areas are much longer. Adults, in particular, meet services that are patchy, under-resourced, or missing.

As a result, many people who are unambiguously Autistic will never be assessed, and excluding them from identity and community on administrative grounds helps no one.

Is self-identification accurate?

Research on self-identification is still limited. What exists suggests self-identifying adults usually reach their understanding through long, careful reflection, and look similar to diagnosed adults on many measures (McDonald, 2020; Overton et al., 2024; Sarrett, 2016). There's little evidence that large numbers of non-Autistic people are wrongly claiming the identity. Meanwhile, the cost of the opposite mistake, telling an Autistic person they're not entitled to understand themselves, is considerable.

Who gets missed

Recognition isn't equal. The diagnostic criteria were built mainly from studies of white boys, and the clinical instincts built on top of them inherit that narrowness. Autistic girls and women are diagnosed later, if at all, partly because they often mask intensively and partly because clinicians look for a template they don't match, and the same applies to many non-binary and trans Autistic people. Autistic people of colour face later identification (Mandell et al., 2009) and often a very different institutional response, with distress more likely to be read as conduct or risk than as unmet need. People with intellectual disability are often assumed to have no inner account, and are rarely asked. And people in poverty meet diagnostic pathways that in practice need money, persistence, articulate self-advocacy and time off work.

Many people, especially AuDHD adults, receive an ADHD or mental health diagnosis first, and their Autistic experience goes unrecognised for years.

In populations that are systematically under-identified, being undiagnosed is the expected state, not the exception. The absence of a diagnosis says far less about a person than the presence of one.

Identity and diagnosis are different things

A diagnosis matters for access to statutory support and some services, and it's worth pursuing if you need those. But it isn't the gateway to identity. You can know you're Autistic before diagnosis, without diagnosis, or with no prospect of one. Autistic pride, community and self-advocacy aren't secondary. They are central to wellbeing.

If you're exploring, a few gentle steps: read what Autistic people write about their own lives, notice what fits and what doesn't, and talk to others. Remember that everything you read is a hypothesis to test against your own experience. If you're in burnout, rest first. And if you decide to seek a formal assessment, it's reasonable to ask for help with the process, and to bring examples of your everyday life, not only childhood history.

For children and young people, waiting for a diagnosis shouldn't mean waiting for support. Schools and families can respond to needs now. See Autistic Realms' family and education resources.

Belonging without a letter

You don't have to wait for a letter to read Autistic writing, follow Autistic creators, or spend time in Autistic community. Many spaces welcome people who are exploring, and a good Autistic space won't ask to see your paperwork. See Autistic Realms' list of Autistic-led organisations, Autscape and the NeuroHub community. See also our guide to late identification and to building a positive Autistic identity.

Common questions

Can I call myself Autistic without a diagnosis?

Yes. Self-identification is treated as valid, especially given long waiting lists and unequal access. You can also pursue a formal diagnosis where you need it for support.

Is self-diagnosis accurate?

Research is still limited, but it suggests self-identifying adults usually reach their understanding carefully and resemble diagnosed adults on many measures.

Why are so many Autistic people diagnosed late?

Diagnostic criteria came mostly from studies of white boys, so girls, women, non-binary and trans people, people of colour, adults and people in poverty are more often missed or diagnosed late. Masking also hides presentation.

Does a diagnosis change who I am?

No. It can unlock support and give you words for your experience, but you were Autistic before the letter. Identity doesn't depend on it.

References

• Lai, M.-C., & Baron-Cohen, S. (2015). Identifying the lost generation of adults with autism spectrum conditions. The Lancet Psychiatry, 2(11), 1013–1027.
• Mandell, D. S., Wiggins, L. D., Carpenter, L. A., Daniels, J., DiGuiseppi, C., Durkin, M. S., Giarelli, E., Morrier, M. J., Nicholas, J. S., Pinto-Martin, J. A., Shattuck, P. T., Yeargin-Allsopp, M., & Kirby, R. S. (2009). Racial/ethnic disparities in the identification of children with autism spectrum disorders. American Journal of Public Health, 99(3), 493–498.
• McDonald, T. A. M. (2020). Autism identity and the "lost generation": Structural validation of the Autism Spectrum Identity Scale and comparison of diagnosed and self-diagnosed adults on the autism spectrum. Autism in Adulthood, 2(1), 13–23.
• Overton, G. L., Marsà-Sambola, F., Martin, R., & Cavenagh, P. (2024). Understanding the self-identification of autism in adults: A scoping review. Review Journal of Autism and Developmental Disorders, 11, 682–702.
• Sarrett, J. C. (2016). Biocertification and neurodiversity: The role and implications of self-diagnosis in autistic communities. Neuroethics, 9(1), 23–36.