Why are diagnostic criteria for Autism changing?

A change in the diagnostic criteria for autism was needed because the old classification has proved inaccurate as research data have accumulated. It had been shown that the child's ethnic and socio-economic background, level of cognitive development, age, and gender influenced the diagnosis 

The distribution of the diagnosis given to a child into broad subgroups of developmental disorders also proved unreliable. The diagnosis has been shown to vary depending on the age, time, and diagnosis of the child.

The diagnosis of Asperger's syndrome has also been shown to be inaccurate in studies. Many cognitive-age individuals diagnosed with Asperger’s Syndrome (ICD-10, DSM-IV) also meet the diagnostic criteria for atypical autism (ICD-10) and unspecified autism (DSM-IV)

ICD-10 and DSM-IV, three core areas of autism have been identified: difficulties in social reciprocity, lack of communication, and limited, repetitive behaviors. However, research evidence does not confirm the division of diagnostic criteria into three core symptom areas it has been found that the difficulties of social reciprocity and the difficulties of communication overlap and reflect the difficulties of both linguistic and non-linguistic social communication. Instead, abnormalities in linguistic communication, such as stereotypical speech, echo speech, and linguistic rituals, overlap with repetitive behavior.

Diagnoses previously classified as widespread developmental disorders (ICD-10, DSM-IV) have been grouped together in the revised classifications (ICD-11, DSM-5) into a single diagnosis of autism spectrum disorder. It defines core symptoms into two areas: 1) deficiencies in social reciprocity and communication, and 2) limited, repetitive, and inflexible patterns of behavior and interests. Diagnostic criteria have also been refined to improve the reliability of diagnostics in children of different ages and cognitive abilities and to take into account gender differences 

The exact age limit by which the developmental abnormality should be reflected has been removed from both revised diagnosis classifications. However, autism spectrum disorder should occur during the developmental period before the age of 18, typically in early childhood. However, symptoms may also occur later when the social requirements of the environment exceed the person's limited abilities 

The DSM-5 interference classification was published in 2013, but its translation is still pending. The ICD-11 disease classification has also been published. Both classifications have been modified as described above is essentially the same direction.

The biggest difference in the classifications can be found in the refinements. The DSM-5 disorder classification defines the degree of severity for both groups of core symptoms based on the functional impairment caused by the behavioral patterns. Level 1 requires very substantial support, Level 2 requires substantial support, and Level 3 requires support.

When diagnosing autism spectrum disorder according to DSM-5, please also specify whether the child's intellectual and linguistic performance is normal or impaired, whether the symptom is related to a medical condition, a genetic syndrome or an environmental factor, or other developmental, mental, and behavioral disorders.).

According to current knowledge, intellectual development and language disorder are classified in the ICD-11 classification using refinement codes when a patient is diagnosed with an autism spectrum disorder.

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