What Are the 3 Cardiac Enzymes?

5 min read 2026-06-03

Cardiac enzymes are proteins released into the bloodstream when the heart muscle is damaged. These markers are measured when the patient arrives at the hospital with symptoms such as chest pain or shortness of breath.

Elevated cardiac enzyme levels can help confirm a heart attack (myocardial infarction). So, what are the 3 cardiac enzymes?

The Key Cardiac Biomarkers

The key cardiac biomarkers used to detect heart damage are:

Troponin
Creatine Kinase-MB (CK-MB)
Lactate dehydrogenase Myoglobin
Aspartic Aminotransferase (AST)

The three commonly measured cardiac enzymes or biomarkers are:

Among them, troponin is the most specific. It is a widely used marker for diagnosing heart attacks today. However, doctors often measure several biomarkers together to improve diagnostic accuracy.

How Do Cardiac Enzymes Indicate Heart Damage?

Cardiac enzymes are normally found inside heart muscle cells. When the heart muscle is injured due to reduced blood flow, these enzymes escape into the bloodstream. Blood tests can detect their levels, which helps doctors determine whether a heart attack has occurred and how severe it may be.

So, whenever any kind of trauma happens to the body, it leads to myocardial injury, and these cardiac biomarkers are released.

Early Detection Can Save Lives

Cardiac enzyme testing plays a key role in identifying heart muscle injury. By measuring these biomarkers in the bloodstream, doctors can detect and assess heart damage. Recognising symptoms early and seeking immediate medical care allows timely testing and may improve the chances of effective treatment.

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