On exam, this 19-year-old woman has malar rash characterized by pink-violet papules and plaques with no other physical finding. ANA is positive and urinalysis is remarkable for 3+ blood and protein. What test is the most appropriate next step?
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On exam, this 19-year-old woman has malar rash characterized by pink-violet papules and plaques with no other physical finding. ANA is positive and urinalysis is remarkable for 3+ blood and protein. What test is the most appropriate next step?