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) test. a blood test used to detect damage to the heart muscle, skeletal muscles, and brain. Serum CK levels are elevated whenever such damage occurs. CK is the main cardiac enzyme studied in patients with heart disease.