Does this test have other names?
Cardiac troponin (cTn), cardiac troponin I (cTnI), cardiac troponin T (cTnT), high-sensitivity
cardiac troponin (hs-cTn)
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, they
can release troponin and other substances into the blood. This is most often when
the heart isn't getting enough oxygen and nutrients.
Measuring your troponin level 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 may need 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 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?
Test results may vary depending on your age, gender, health history, and other things.
Your test results may be different depending on the lab used. They may not mean you
have a problem. Ask your healthcare provider what your test results mean for you.
Results are given in nanograms per milliliter (ng/mL) or liter (ng/L). Different labs
use slightly different normal ranges and results can vary depending on the type of
troponin test done. For example, the normal range for troponin I is between 0 and
0.04 ng/mL but for high-sensitivity cardiac troponin (hs-cTn) normal values are below
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:
High-sensitivity cardiac troponin (hs-cTn)
High-sensitivity cardiac troponin is a newer type of testing that can detect lower
levels of troponin. This may help diagnose heart injury and acute coronary syndrome
earlier. Your healthcare provider will explain which type of troponin testing was
done and what the results mean for you.
How is this test done?
The test is done with a blood sample. A needle is used to draw blood from a vein in
your arm or hand.
Does this test pose any risks?
Having a blood test with a needle carries some risks. These include bleeding, infection,
bruising, and feeling lightheaded. When the needle pricks your arm or hand, you may
feel a slight sting or pain. Afterward, the site may be 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 and can take several
days to clear from the bloodstream. Your healthcare provider may need to measure it
several times over a few hours after the symptoms start.
How do I get ready for this test?
You don't need to prepare for this test. 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 illegal drugs you may use.