How do we screen for autism?

In recent years, autism rates have tripled due to advances in diagnostic capabilities and a greater understanding of autism. But how do you test for it? What goes into developing these tools? Dr. Diana Robins is the director of the AJ Drexel Autism Institute, and she developed the M-CHAT, or Modified Checklist for Autism in Toddlers. She tells us about the process of building this tool, how effective it can be when used properly, and how these screening tools can be improved over time.