When evaluating a 4-year-old child with suspected autism spectrum disorder, which component of the family history is MOST important to obtain?

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AParental education level
BFamily income status
CMaternal age at delivery
DPresence of autism spectrum disorder in siblings

✓ Correct answer: D. Presence of autism spectrum disorder in siblings The presence of autism spectrum disorder in siblings is the most important family history component as it significantly increases the risk of ASD in subsequent children. Sibling recurrence risk is estimated at 20%, making it a crucial factor in evaluation compared to other family demographic factors.

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When evaluating a 4-year-old child with suspected autism spectrum disorder, which component of the family history is MOST important to obtain?

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