Canvas Dx is a prescription diagnostic aid to healthcare professionals (HCP) considering the diagnosis of Autism Spectrum Disorder (ASD) in patients 18 months through 72 months of age at risk for developmental delay. The patient’s caregiver uses a smartphone application (“App”) to fill out a caregiver questionnaire and to make video recordings of behavior at home, and then the physician fills out a medical questionnaire online. The results are made available to the physician.