Enzymes are proteins that help your body accomplish certain chemical processes, such as breaking down food and clotting blood. They’re used throughout your body for many vital functions. Abnormal enzyme levels can indicate many different conditions.

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* Creatine phosphokinase (CPK-1). This is found in your lungs and brain. High levels can indicate brain injuries or cancer.

* CPK-2 (CK-MB). These enzymes are found in your heart. They often increase in your blood after a heart attack or other heart injury.

* CPK-3. These enzymes are also found in your heart. They often result from muscle inflammation, injury, or intense exercise.

* Troponin. This is a heart enzyme that can leak into your blood and results from heart injury.