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The serum creatine kinase (CK) concentration is often—but not always—elevated in muscle disease. The degree of elevation, together with clinical, electrophysiological, radiological and histological characteristics, can help to characterise individual myopathies.1 ,2 Previous reports have described the most common causes of an elevated serum CK (and the expected range of CK values) in text or tabular form, but not …
Competing interests None.
Provenance and peer review Provenance and peer review. Not commissioned; externally peer reviewed. This paper was reviewed by David Hilton-Jones, Oxford, UK.