Serum CK as a guide to the diagnosis of muscle disease.

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 …