Autism spectrum disorders ASD is a group of pervasive developmental disorders, manifested mainly through the lack of ability to social interaction, communication disruption and stereotyped behavior. Despite of generally recognized practical and theoretical significance of studying the mechanisms of formation, it still has got little attention.

The article represents some approaches to differential diagnosis of autism and similar conditions. The authors make an attempt to find out the main reasons for such sharp increase in the number of patients suffering from this disease. The article aims analysis of existing research and contains the results of complex diagnostics and the mechanisms of disorders formation. In solving the problem of ASD formation mechanisms, clinical data, medical history data, genetic confounding factors and course of prenatal, natal and postnatal periods are used.

In their findings, the authors develop the technology for ASD and similar conditions differential diagnostics; diagnostic markers and algorithm for the development of psychological and pedagogical treatment programs are suggested.