What tool is used to screen for autism spectrum disorder at 18 months of age?

The M-CHAT questionnaire, or the Modified Checklist for Autism in Toddlers, is specifically designed to screen for autism spectrum disorder in children at 18 months of age. It focuses on identifying early signs of autism by assessing behaviors related to social communication and interactions that are commonly associated with the spectrum. Administering this tool at 18 months is crucial, as early detection can lead to timely intervention, which can significantly improve developmental outcomes for children who have autism.

The ASQ questionnaire, while useful for developmental screening in general, is broader in scope and not specifically designed for autism. The Denver Developmental Screening primarily assesses development in areas such as language and motor skills, but it does not focus specifically on autism. The Behavior Assessment System is more comprehensive and is typically used for evaluating behavior problems and emotional issues, rather than specifically screening for autism spectrum disorder. Thus, the M-CHAT is uniquely positioned as a reliable tool for the early identification of autism at this critical age.