What laboratory evaluation is most likely to be abnormal in this 10-year-old patient who also had discrete facial erythema?
Correct Answer: Creatine kinase
Description: Answer B. Creatine kinaseMultiple hyperkeratotic, erythematous, flat papules with central atrophy are notable on the dorsum of the metacarpophalangeal and interphalangeal joints, consistent with Gottron's papules. Though muscle-strength examination was normal, laboratory evaluation revealed an elevated level of creatine kinase suggestive of dermatomyositis.
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