For these employees, when a holiday falls on a nonworkday -- Saturday or Sunday -- the holiday usually is observed on Monday (if the holiday falls on Sunday) or Friday (if the holiday falls on Saturday).
CK-MB. 1  A creatine kinase-MB (CK-MB) test may be used as a follow-up test to an elevated creatine kinase (CK) in order to determine whether the increase is due to heart damage or skeletal muscle damage.
Creatine kinase (CK) is an enzyme found in the heart, brain, and skeletal muscle. High amounts of CK are released into the blood when there is muscle damage. A CK blood test may be used to detect inflammation of muscles (myositis) or muscle damage due to muscle disorders (myopathies).