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What Are Borderline Cases in Autism Diagnosis? 

Posted
Updated
ByMy Patient Advice
Author: Lucia Alvarez, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Yes, borderline autism refers to situations where an individual shows some autistic traits but does not fully meet the established diagnostic criteria. These cases often fall into a diagnostic grey area, making them more challenging to assess. People in this category may have mild social communication differences, certain repetitive behaviours, or sensory sensitivities, but the combination and severity do not reach the threshold for a formal diagnosis. 

For example, a child might have notable sensory sensitivities and mild social difficulties but demonstrate strong adaptive functioning, meaning they can manage everyday life with minimal support. Research highlights that such individuals may still experience functional challenges, even without meeting the full diagnostic criteria. Similarly, some adults may only display traits under high-stress conditions, making the presentation inconsistent and more difficult to categorise. These cases often require careful monitoring over time to determine whether a diagnosis becomes more appropriate as symptoms evolve.  

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Recognising Subthreshold Traits 

In cases of borderline autism, individuals may still display features worth noting: 

  • Subtle challenges in understanding social cues 
  • Preference for routines but without significant disruption to daily life 
  • Focused interests that are strong but not all-consuming 
  • Occasional sensory sensitivities that do not severely impact functioning 

Why These Cases Matter 

Identifying subthreshold traits can be valuable for support planning. Even without a formal diagnosis, individuals might benefit from targeted interventions in education, workplace adjustments, or social skills development. Clinicians often recommend ongoing monitoring, as traits may become more or less apparent over time. 

For personalised advice and guidance on autism assessments, visit providers like Autism Detect for personal consultations. 

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Autism Diagnostic Criteria (DSM-5, ICD-11).

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Lucia Alvarez, MSc
Author

Lucia Alvarez is a clinical psychologist with a Master’s in Clinical Psychology and extensive experience providing evidence-based therapy and psychological assessment to children, adolescents, and adults. Skilled in CBT, DBT, and other therapeutic interventions, she has worked in hospital, community, and residential care settings. Her expertise includes grief counseling, anxiety management, and resilience-building, with a strong focus on creating safe, supportive environments to improve mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy. 

Dr. Rebecca Fernandez, MBBS
Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy. 

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