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.
The creatine kinase test measures the blood levels of certain muscle and brain enzyme proteins. Creatine kinase (CK or CPK) is an enzyme (a type of protein) found in muscle and brain.Normally, very little CK is found circulating in the blood. Elevated levels indicate damage to either muscle or brain; possibly from a myocardial infarction (heart attack), muscle disease, or stroke.reatine kinase (CK or CPK) is an enzyme (a type of protein) found in muscle and brain.