ASDs are currently diagnosed by behavioral observation. The purpose of this study is to identify and examine correlations between potential biochemical, behavioral and physical biomarkers in children with ASDs. The identification of clinically validated biomarkers for ASDs would form the basis for a paradigm shift in the way clinicians identify, diagnose and treat ASDs. Predictive biomarkers might allow for earlier identification of individuals at risk and targeting appropriate and earlier treatment. Correlation of biomarkers with physical and behavioral phenotypes could also help with predicting and tracking outcomes and potentially, in future, allow for targeting specific treatments. An additional purpose of the study is to investigate the feasibility of conducting autism biomarker research within the clinical setting in an effort to strengthen the Autism Consortium clinical network’s ability to conduct larger scale clinical translational research.