To reduce the average age of autism diagnosis, screen preschoolers in primary care.

LAY ABSTRACT: Pediatric primary care providers check for autism signs, usually using a standard checklist, at 18- and 24-month well-child visits. When the checklist shows possible autism, children should be referred for additional treatment and evaluation with an autism specialist. However, many children with autism spectrum disorder are not detected as toddlers. Low-income and minority children are particularly likely to have a late autism spectrum disorder diagnosis. Checking for autism at preschool-aged well-child visits might be one way to identify autism spectrum disorder earlier, especially for low-income and minority children.