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 CK test may be done to check for muscle injury. It can give an idea of how bad the injury is, when it happened, and whether it is healing. Other blood tests may be needed to find which area has been injured. The test may be done to: 1  Diagnose the cause of chest pain, such as heart muscle damage from a heart attack.