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Review Question - QID 8527

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QID 8527 (Type "8527" in App Search)
Laboratory examination of a 5-year-old boy who toe-walks and recently began tripping and falling revealed a creatine phosphokinase level 10 times higher than the normal level. He has one 11-year old brother who walks normally. To confirm the diagnosis of Duchenne muscular dystrophy, a creatine phosphokinase test should be ordered on which family member?