When performing developmental screenings in the well-child clinic, the registered nurse understands that which child is at highest risk of developing autism spectrum disorder?

Question

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Although the cause of autism spectrum disorder (ASD) is unknown, numerous studies indicate that it has a strong genetic component. The underlying genetic source is unknown in the majority of cases; however, researchers hypothesize that genetic factors predispose to an autism phenotype and that genetic expression is influenced by environmental factors. (Option A) A 2-year-old with a vocabulary of a few words only is a concern; however, there are a number of factors and/or conditions that could cause language or overall developmental delay. (Option B) There is no scientific evidence that the measles, mumps, and rubella vaccine or thimerosal-containing vaccines (eg, influenza) are linked to ASD. (Option D) Retrospective studies have linked parents of older age to autism; however, this association is inconclusive. Educational objective: There is strong scientific evidence of a genetic component to autism spectrum disorder (ASD). As a result, parents who have a child with ASD are at higher risk of having another child with this disorder. There is no evidence that supports a link between vaccines and ASD, and studies on associations between advanced parental age and the disorder are inconclusive.

When Performing Developmental Screenings in the Well-Child Clinic, the Registered