The enzymes level used for evaluation of myopathies is

Clinical suspicion for a myopathy is high, generally corroborated by elevated creatine kinase (CK) levels, it is often reasonable to skip or limit the extent of the EDX studies. Finally, EDX studies may be normal in selected muscle diseases (ceain endocrine, metabolic, congenital, and mitochondrial myopathies). Thus, in the appropriate clinical context, normal EDX studies do not necessarily rule out the presence of a myopathy.