All autistics share what is called the triad of impairments...being lack of eye contact, repetitive movements, and social 'impediments'. Other than that each autistic child is like a snow flake, all of them are unique and each has their own set of issues unique to them. Autism has many levels of severity. Aspergers is a form of high functioning autism. ADHD is a totally different disorder but many autistics share add/adhd diagnosis. Autism is referred to as a spectrum disorder simply because no one child is the same as the other. But to answer your question to be diagnosed as autistic the triad of impairments must be met. Autistic tendencies could fall under another diagnosis that many autistics share PDD-NOS (pervasive developmental disorder not otherwise specified)