Psychologist, developmental pediatrician, or pediatric neurologist is the best doctors to do the disorder diagnosis. These doctors screen the child by observing the behavior, interviewing, and then evaluating the child. Since this kind of screening is a not definite test to confirm autism spectrum disorder, terms such "it looks like" or "it appears to be" are used by these physicians. The reason behind is that, the outcome of the screening is just the doctor's opinion and not yet conclusive.
A comprehensive autism spectrum disorder diagnosis by a multi-disciplinary team is followed to confirm the diagnosis. Several autism spectrum disorder diagnosis screening tools have been made to hasten the information gathering about a child's social and communicative development within medical setup such as the Checklist of Autism in Toddlers (CHAT), the modified Checklist for Autism in Toddlers (M-CHAT), the Screening Tool for Autism in Two-Year-Olds (STAT), and the Social Communication Questionnaire (SCQ) for children age 4 and older. Another tool often used by the team is the Childhood Autism Rating Scale (CARS). It helps in evaluating the child's body gestures, listening, and verbal communication.
The disorder diagnosis will make parents understand the condition of their children and what help is needed. The multi-disciplinary team can recommend programs for problems in speech delays, hearing impairment, and social deficits. Parents need to understand that once autism spectrum disorder is diagnosed, it is not the end of the world for the child. The diagnosis makes it easier for people concerning this disorder to move forward and for the child to live a normal life.