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How is polymyositis diagnosed?

Suhail Kumar, MD
Rheumatology

Polymyositis is diagnosed with a thorough history and physical examination.  Clinical suspicion is then corroborated with laboratory examination including creatine kinase (CK) and acute phase reactant levels.  Additional diagnostic testing with electromyography (EMG) and MRI can be performed.  Finally muscle biopsy is used for confirmation. 

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