A doctor who suspects muscular dystrophy will take a clinical history, perform a physical exam, and measure blood levels of creatine kinase, a muscle enzyme released into the blood by deteriorating muscle fibers. if a child has a high level of this enzyme, the doctor may order a DNA test or a muscle biopsy. The DNA test checks for gene abnormalities, and the muscle biopsy reveals patterns of muscle deterioration and abnormal levels of dystrophin, a building block of muscle. These tests reveal the type of muscular dystrophy the child has.

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