Both HFA and AS are Identified through the Diagnostic and Statistical Manual (DSM-IV) or ICD-10, World Health Organization
Diagnostician looks at three groups of symptoms to make DSM diagnosis:
Some traits are common to both HFA, PDD-NOS, and AS
Degree of severity may also vary between HFA, PDD-NOS, and AS
The DSM-IV is in the process of being updated. The term Asperger's may not be included on the new Autism Spectrum, but Asperger-like references might still be used in reports. The changes are not posted as of this writing, but are anticipated for May 2013.