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, also called CK or creatine phosphokinase or CPK, is a blood enzyme. Tests for CK and the fraction CK-MB are used to confirm the existence of heart muscle damage and are used as rapid detection of a heart attack.reatine kinase, also called CK or creatine phosphokinase or CPK, is a blood enzyme. Tests for CK and the fraction CK-MB are used to confirm the existence of heart muscle damage and are used as rapid detection of a heart attack.