This test measures the amount of creatine kinase (CK) in the blood. CK is a type of protein,

known as an enzyme. It is mostly found in your skeletal muscles and heart, with lesser

amounts in the brain. Skeletal muscles are the muscles attached to your skeleton. They work

with your bones to help you move and give your body power and strength. Heart muscles

pump blood in and out of the heart.A CK test is most often used to diagnose and monitor

muscular injuries and diseases.