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How is Pervasive Developmental Disorder-Not Otherwise Specified (PDD-NOS) Diagnosed?

PDD-NOS isnormally diagnosed by a child psychologist, neurologist or a paediatrician. There is no single diagnostic test that can determine whether or not a child has PPD-NOS. A number of assessments will be carried out by a range of health professionals to assess the child's ability across many areas of their development. Diagnosis is normally made through direct observations of the child, questionnaires and tests.

Diagnosing PPD-NOS can be difficult as there are no set diagnostic criteria; however it is often diagnosed when there are signs and symptoms from other pervasive developmental disorders, but not enough for the person to be diagnosed with a specific condition. It has been suggested that a diagnosis of PDD-NOS should be given when there is a severe and pervasive impairment in the development of social interaction with an impairment in verbal or nonverbal communication, or with a presence of repetitive behaviour, but the criteria are not met for a