CREATINE PHOSPHOKINASE -MB,SERUM

Creatine Phosphokinase – MB, Serum

What it is

The Creatine Phosphokinase – MB (CPK-MB), Serum test measures the MB isoenzyme of creatine phosphokinase in the blood. CPK is an enzyme found in the muscles, brain, and heart, and the MB fraction is mainly located in heart muscle. Measuring CPK-MB levels helps detect and assess cardiac muscle injury, particularly during or after a suspected heart attack.

Uses

This test is commonly used in the diagnosis of myocardial infarction (heart attack), monitoring cardiac injury following surgery or trauma, and distinguishing heart-related muscle damage from skeletal muscle disorders. It is often performed along with other cardiac biomarkers such as troponins for more accurate results.

Symptoms That May Lead to the Test

Your doctor may order this test if you have chest pain, shortness of breath, palpitations, dizziness, excessive sweating, or unexplained fatigue. It is also ordered when acute coronary syndrome is suspected or to monitor recovery after cardiac procedures.

Abnormal Results

Elevated CPK-MB Levels: Strongly suggest heart muscle damage, usually due to myocardial infarction. Levels may also rise in myocarditis, cardiac surgery, electrical cardioversion, or severe chest trauma.

Normal or Low CPK-MB Levels: Generally indicate no significant cardiac injury. However, testing too early after symptoms begin may give normal results, so repeat testing could be required.

Risks

The test involves a simple blood draw. Risks are minimal and may include mild pain, bruising, or dizziness at the puncture site. These effects are temporary and usually resolve quickly.