Adult autism diagnoses are being recorded in a changing clinical context
The medical profiles of adults receiving an autism diagnosis have changed substantially since 2010, according to an analysis of health records from the United Kingdom and Sweden published in BMJ Mental Health. The shift matters because rising diagnosis counts alone do not explain who is being identified, when they are identified, or what other health needs they may bring to care.
The researchers found a move away from prior recorded diagnoses such as epilepsy, psychosis and intellectual disability, and toward attention-deficit/hyperactivity disorder (ADHD), anxiety and depression. The pattern was observed in data from two countries with different health-data systems, strengthening the case that adult autism diagnosis is changing in ways that deserve attention from clinicians and health planners.
The steepest increase in diagnoses was seen among people aged 16 to 20, females and people of white ethnic background. Those findings do not establish why the change is occurring. But they are consistent with a diagnosis landscape shaped by evolving recognition, referral and assessment practices, alongside changes in awareness and stigma.
A large cross-country records study
The team examined UK primary-care records through 2023 and Swedish population-wide registry data through 2021. The UK dataset, CPRD Aurum, covered 47,413,279 patients from 1,784 general practices. The Swedish data covered 13,345,950 people.
Participants had to be at least 16 years old at study entry on January 1, 2010. In the UK, they also needed at least one year of registration with a general practice. Follow-up ended at death, the end of UK primary-care registration, emigration in Sweden, or the end of the relevant study period.
Rather than treating autism as an isolated record entry, the researchers studied each person’s first recorded autism diagnosis alongside trends in other neuropsychiatric conditions. These included intellectual disability, ADHD, epilepsy, migraines or headaches, anxiety, depression, psychosis, bipolar disorders, obsessive-compulsive and related conditions, stress-related conditions, eating disorders, personality disorders, suicidality or self-harm, sleep disorders and chronic fatigue.
The study also examined first recorded prescriptions in the UK. That design allowed the researchers to look beyond how often autism was coded and toward the clinical patterns accompanying diagnosis over time.
Why the shift is important
Autism diagnosis rates have increased worldwide in recent decades. The source study notes that the reasons remain unclear and may include greater public awareness, lower stigma and changes in diagnostic practice. Its findings add another layer: adults now arriving at an autism diagnosis may have different recorded histories and co-occurring conditions than adults diagnosed earlier in the study period.
In practical terms, an adult assessment pathway may increasingly intersect with services for ADHD, anxiety and depression. That does not mean these conditions cause autism, nor does it mean every autistic person has them. It means care systems need to be prepared for a changing mix of needs among people being assessed and diagnosed.
The decline in the prominence of earlier patterns involving epilepsy, psychosis and intellectual disability should also be interpreted carefully. Medical records capture diagnoses that have been made and recorded, not a complete biological account of a person’s life. Changes in diagnostic access, coding, clinical recognition and the ages at which people are assessed can all affect the profile seen in a database.
What the findings do and do not show
The analysis is notable for comparing trends in the UK and Sweden, but it is observational. It identifies changes in recorded diagnoses over time; it cannot determine the precise causes behind them. The study therefore should not be read as evidence that autism itself has changed, or as a way to predict an individual’s health profile from demographic group alone.
Its contribution is more immediate for service design. Adult autism services, mental-health providers and primary-care teams may need pathways that account for frequent overlap with ADHD, anxiety and depression. The particularly sharp increase among 16- to 20-year-olds also highlights a transition period in which young people may be moving between child, education and adult health services.
The observed demographic differences raise further questions about who is being reached by assessment systems and who may still face barriers. Greater diagnosis among females and white ethnic groups may reflect improved recognition for some populations, but record trends alone cannot establish whether access is equitable across all groups.
A prompt for better-integrated adult care
The study’s central message is that adult autism diagnosis should be understood in its wider clinical and social setting. As diagnostic patterns change, health services will need to adapt assessment, support and follow-up rather than relying on assumptions formed around earlier patient populations.
For researchers, the cross-country results create a basis for studying which parts of the trend stem from clinical practice, public awareness, population differences or health-system design. For patients, the findings reinforce that autism assessment in adulthood often sits alongside other mental-health and neurodevelopmental concerns that deserve coordinated attention.
More work will be needed to explain the changes. But the size of the datasets and the consistency of the broad direction across the UK and Sweden make the shift difficult to dismiss as a narrow local effect. Adult autism services are not simply seeing more people; they may be seeing a different clinical picture than they did at the start of the last decade.
This article is based on reporting by Medical Xpress. Read the original article.
Originally published on medicalxpress.com
