blood creatine phosphokinase level increased AE YH, EB elevated serum creatine phosphate kinase AE a blood creatine phosphokinase level abnormal AE that is characterized by an increased level of creatine phosphokinase (CPK) or phosphocreatine kinase, an enzyme expressed by various tissue types that catalyses the conversion of creatine and consumes adenosine triphosphate (ATP) to create phosphocreatine and adenosine diphosphate (ADP) 10005470 blood creatine phosphokinase level abnormal AE