During evaluation of an 8-year-old with sudden behavioral changes, which laboratory test should be ordered FIRST?

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Multiple choice — select the best answer

AVitamin D level
BIron studies
CThyroid function tests
DGenetic testing

✓ Correct answer: C. Thyroid function tests Thyroid dysfunction can present with sudden behavioral changes in children and is readily treatable, making it the most appropriate first-line laboratory test in this situation.

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During evaluation of an 8-year-old with sudden behavioral changes, which laboratory test should be ordered FIRST?

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