Cardiac Enzyme Studies

Cardiac enzyme studies measure the levels of the enzymes creatine phosphokinase (CPK) and creatine kinase (CK), and the proteins troponin I (TnI) and troponin T (TnT) in the blood.

Values and units for reporting the results of cardiac enzyme tests vary considerably. The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what’s normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.

Troponin normal values:^{Reference 1}

• TnI: Less than 0.35 Reference micrograms per liter (mcg/L) Opens New Window
• TnT: Less than 0.2 mcg/L

Total CPK (creatine phosphokinase) normal values:^{Reference 1}

• 0–120 micrograms per liter (mcg/L)

CK-MB (creatine kinase) normal values:^{Reference 1}

• 0–3 micrograms per liter (mcg/L)

© 1995-2011, Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Reference Terms of Use. Reference How this information was developed to help you make better health decisions.