http://www.nlm.nih.gov/medlineplus/ency/article/003503.htm serum creatine phosphokinase serum creatine phosphokinase CK Creatine phosphokinase test serum creatine phosphokinase http://www.nlm.nih.gov/medlineplus/ency/article/003503.htm CK Creatine phosphokinase test CK medline page CK MedlinePlus: Creatine Phosphokinase Creatine Phosphokinase Test Creatine phosphokinase test CPK CK