Pesky you might be interested in the Introduction to this study  While several diagnostic scales for children and adolescents with ASD are available Attwood  Ehlers et al  only one peerreviewed scale The AutismSpectrum Quotient AQ was designed specifically for adults BaronCohen et al  Its authors emphasize that it is useful in identifying autistic traits and as a screening instrument but not as a diagnostic tool As a diagnostic tool The Ritvo Autism Asperger Diagnostic ScaleRevised RAADSR  will be more reliable though perhaps less easy to administer than an orientative screening tool like AQ