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.
Other names: CK-MB Test. CK-MB is a form of creatine kinase; it is found mostly in the heart muscle. Levels of CK-MB rise after a patient has sustained damage to the heart muscle.