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.
CK, formerly known as creatinine phosphokinase, is an important protein enzyme catalyzing the reversible phosphorylation reaction. ADP + creatine phosphate â ATP + creatine. CK is a dimeric molecule composed of M and/or B subunits. Two protein subunits form into 3 different isozymes: CK-MM, CK-MB, and CK-BB. CK-MM and CK-BB are abundantly found in skeletal muscle and the brain, respectively.