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The heart releases heart enzymes when there is damage to the heart or stress because of low
oxygen. Levels of troponin and Creatine Phosphokinase (CPK) increase after a heart attack. High
levels of heart enzymes may also indicate acute coronary syndrome. A heart enzyme test is a
blood test for the measurement of specific enzyme levels in the blood to check whether anyone
has or has ever had a heart attack. The doctor can ask for the test if the person has signs of
chest pain, dizziness, fatigue, shortness of breath, sweating and chills and vomiting.
A blood test of cardiac enzymes is like a normal blood test. The doctor will evaluate the
biomarker levels to confirm whether the person had a heart attack and measure the severity of
the damage to the heart muscle. They frequently check levels multiple times to see if they
change over time. Besides checking the biomarkers, doctors may also want to test blood for
other markers to check cholesterol levels, sugar level, platelet levels, kidney function and levels
of B-type natriuretic peptide (BNP). Cardiac enzymes also called cardiac biomarkers include
myoglobin, troponin and creatine kinase. Troponins are the most recognized and important
cardiac enzymes used to diagnose acute myocardial ischemia in modern medical practice.
What is a Troponin test?
A troponin test evaluates the level of troponin in the blood. Troponin is a type of protein that is
present in the muscles of the heart. Troponin is not usually found in the bloodstream. One of
the heart muscles becomes damaged, troponin is sent into the blood. As heart damage
increases, more troponins are released into the blood.
What is the normal heart enzyme level?
People with a healthy heart have troponin levels below 0.02 ng/mL (nanograms per milliliter).
Higher than the normal level indicates severity. Other reasons for higher troponin levels are:
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