There is currently no medical test that can confirm a diagnosis of autism. A diagnosis of autism is based on observed behavior, developmental history, and autism specific instruments when needed (ADOS, ADI). The ADOS and ADI-R can be used in conjunction with clinical judgment to confirm a diagnosis of autism.
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The Dan Marino Foundation answeredAlthough autism is considered a neurological disability, no specific medical test or procedure can confirm a diagnosis of autism. To gather more information that will accurately profile an individual’s strengths and needs, a variety of tests, assessments, and evaluations should be administered.
Source: Center for Autism & Related Disabilities (CARD)