PDD-NOS is also commonly used to describe atypical symptoms of autism, cases in which onset is not prior to 30 months of age, and individuals who present with autism symptoms and comorbid disorders, such as ADHD ( Buitelaar et al. Clinically, PDD-NOS diagnoses are generally used for less severe cases that do not meet full criteria for autistic disorder or cases in which the required profile of diagnostic criteria is not present (e.g., an individual who does not have at least two symptoms in the social domain). A diagnosis of PDD-NOS is commonly used as a diagnosis of exclusion and is often seen as a “catch all” diagnostic category used when criteria for other PDD diagnoses are not met ( Filipek et al. 1994).ĭespite ongoing theoretical debate regarding the categorical boundaries of PDD-NOS, no reliable diagnostic criteria have emerged ( Matson and Boisjoli 2007). Pervasive developmental disorder, not otherwise specified (PDD-NOS) is often thought to represent the less severe end of a spectrum of autism severity and is sometimes loosely interchanged with the label of high functioning autism to denote a milder version of autism ( Volkmar et al. The conceptualization of autism as a spectrum disorder suggests that the disorder exists on a continuum of impairment, with autistic disorder representing the most severe presentation of the disorder. ![]() Autism spectrum disorders (ASD) are neurodevelopmental disorders characterized by impaired social interactions, deficits in verbal and nonverbal communication, and repetitive behaviors or unusual or severely limited interests ( American Psychiatric Association 2000).
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