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Purpose: The present study examined and compared professional assessment and diagnostic practices relating to autism spectrum disorder (ASD) in Mexico and the United States (U.S.). This information is of great importance because there is an extremely limited amount of information pertaining the assessment and diagnostic practices for ASD in Mexico and little is known about how these practices compare to those in the U.S.

Methods: Archival data from a survey investigating ASD in the U.S. and Mexico was used for this study. Participants included 29 professionals from the U.S. and 7 professionals from Mexico. Professionals were from a variety of different occupations, but all reported to be involved in the diagnosis of ASD.

Results: In both Mexico and the U.S., most professionals reported use of similar ASD related assessment and diagnostic practices, and ASD related assessment and diagnostic practices were frequently in alignment with current best practices recommendations. However, there were professionals from both Mexico and the U.S. that reported use of diagnostic tools and practices that did not adhere to recommendations, such as, use of outdated versions of the DSM, diagnosis of ASD individually, and evaluation of individuals in one setting.

Conclusion: An understanding of the assessment and diagnostic practices currently being used in Mexico and in the U.S. provides both researchers and clinicians with a better understanding of what is being implemented by different professionals. Additionally, an understanding of the assessment and diagnostic practices for ASD in Mexico is of particular importance for professionals practicing in the U.S. as most immigrants in the U.S are from Mexico therefore it is likely professionals in the U.S. will encounter patients on their caseloads that received diagnoses of ASD in Mexico.