What is the purpose of cardiac marker tests?

Cardiac marker tests measure the levels of specific proteins or enzymes that are released into the bloodstream when the heart muscle is damaged. These tests are used to help diagnose and monitor heart conditions such as heart attack, unstable angina, and heart failure.

Cardiac markers can also be used to assess the severity of a heart condition and to track its progression over time. In some cases, cardiac marker tests can also be used to predict the risk of developing a heart condition.

The most common cardiac markers are:

* Troponin: Troponin is a protein that is found in the heart muscle. When the heart muscle is damaged, troponin leaks into the bloodstream. Troponin levels typically start to rise within a few hours of a heart attack and can remain elevated for up to several days.

* Creatine kinase (CK): CK is an enzyme that is found in the heart muscle and other tissues, such as the brain and skeletal muscles. When the heart muscle is damaged, CK leaks into the bloodstream. CK levels typically start to rise within a few hours of a heart attack and can remain elevated for up to several days.

* Myoglobin: Myoglobin is a protein that is found in the heart muscle. When the heart muscle is damaged, myoglobin leaks into the bloodstream. Myoglobin levels typically start to rise within a few hours of a heart attack and can return to normal within 24 hours.

Cardiac marker tests are typically performed on a blood sample that is drawn from a vein in the arm. The results of cardiac marker tests are usually available within a few hours.