CKMB (Creatine Kinase-MB)

Creatine kinase-MB (CK-MB) is a cardiac enzyme test used to detect and monitor injury to the heart muscle. It is most commonly requested when a patient presents with chest pain, pressure, or other symptoms suggestive of a heart attack (myocardial infarction), and it may also be used to monitor for further cardiac damage after a known event or following cardiac procedures. Because CK-MB is found predominantly in heart muscle, a rise in its level can indicate that cardiac tissue has been damaged.

The test is performed on a simple blood sample, with the CK-MB level measured using a quantitative immunoassay technique. Results are typically interpreted alongside other cardiac markers, the patient's symptoms, and an electrocardiogram (ECG) to build a complete clinical picture.

Biomarkers Included

Cardiac Muscle Enzyme
- Creatine kinase-MB (CK-MB): an isoenzyme of creatine kinase found mainly in cardiac muscle. Elevated levels can indicate injury to heart muscle cells, and serial measurements may be used to track the pattern of damage over time.

Why it matters
CK-MB provides a direct signal of cardiac muscle injury, helping clinicians confirm or exclude a heart attack, assess the extent of damage, and detect further injury after an initial event. When interpreted with the patient's history, ECG findings, and other cardiac markers such as troponin, CK-MB supports timely and informed decisions about urgent cardiac care and ongoing monitoring.