Facilitating Autism Diagnosis in Shorter Timeframes by PCCs

This study is looking at time to diagnostic resolution for children ages 18-36 months with concern of ASD. The main purpose of this research study is to see if the time between when a child aged 18-36 months fails an autism screen or a clinician raises concern and is evaluated is shorter in the primary care practices where the clinicians have been trained to conduct diagnostic evaluations. The training includes use of the Childhood Autism Rating Scale-2, which is validated for use in children 2 and older. The investigators also want to learn more about whether primary care clinicians can accurately evaluate and diagnose young children ages 18-36 months of age with autism spectrum disorder (ASD).