Does this test have other names?
Cardiac troponin (cTn), cardiac troponin I (cTnI), cardiac troponin T (cTnT)
What is this test?
This test measures the amount of the protein troponin in your blood.
Troponin is found in cells in your heart muscle. When these cells are injured—most
often because the heart isn't getting enough oxygen and nutrients—they can release
troponin and other substances into the blood.
Measuring your levels of troponin often can quickly tell your healthcare provider
whether you are having a heart attack. During a heart attack, an artery that feeds
your heart muscle with blood becomes blocked.
Why do I need this test?
You might have this test if your healthcare provider suspects that you are having
a heart attack. Symptoms of a heart attack often include:
Pain or discomfort in the chest that may feel like a squeezing sensation or a sense
Pain in other areas, such as the neck, back, arm, or jaw
Shortness of breath
Lightheadedness or dizziness
Nausea or vomiting
What other tests might I have along with this test?
Your healthcare provider may also order other tests to diagnose a heart attack and
learn more about how it's affecting the heart. These tests often include:
Electrocardiogram (ECG) to measure the heart's electrical activity
Blood tests to measure creatine kinase MB, a substance found in heart muscle and other
What do my test results mean?
Many things may affect your lab test results. These include the method each lab uses
to do the test. Even if your test results are different from the normal value, you
may not have a problem. To learn what the results mean for you, talk with your healthcare
Results are given in nanograms per milliliter (ng/mL). The normal range for troponin
is between 0 and 0.4 ng/mL.
Other types of heart injury may cause a rise in troponin levels. These include:
Conditions in other parts of your body may cause troponin levels to rise. These include:
How is this test done?
The test requires a blood sample, which is drawn through a needle from a vein in your
Does this test pose any risks?
Taking a blood sample with a needle carries risks that include bleeding, infection,
bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight
stinging sensation or pain. Afterward, the site may be slightly sore.
What might affect my test results?
Having this test too soon after a heart attack may give a false-negative. Cardiac
troponin takes a few hours to rise after heart-cell death begins. Your healthcare
provider may need to measure it several times over a few hours after the symptoms
How do I get ready for this test?
You don't need to prepare for this test. But be sure your healthcare provider knows
about all medicines, herbs, vitamins, and supplements you are taking. This includes
medicines that don't need a prescription and any illicit drugs you may use.