Troponin test
Note: this site is for informational purposes only. To view test results or book a test, use the NHS app in England or contact your GP.
A troponin test checks for signs of heart damage. It is most often used when you arrive at hospital with chest pain. The test helps doctors decide quickly whether you have had a heart attack or if another condition is causing your symptoms.
Who needs this test
You will usually have this test in hospital if you arrive with chest pain that could be a heart attack. Doctors use it as an emergency test. It is not a routine test that your GP would request.
The test is done alongside other checks. These include an ECG (a recording of your heart’s electrical activity) and a physical examination. Together, these give doctors the full picture they need.
A heart attack happens when a blocked artery cuts off the blood supply to part of your heart muscle. The medical term is myocardial infarction. Most heart attacks cause chest pain or pressure, sometimes spreading to the neck or arm, along with breathlessness and sweating. If you think you or someone else is having a heart attack, call 999 immediately. Find out more on the NHS website.
Preparing for your test
You do not need to do anything special before this test. A nurse or doctor will take a small blood sample from a vein in your arm. You may need a second blood sample one to three hours later. This helps doctors see if your troponin level is changing.
Understanding your results
What the test measures
Troponins are proteins found in muscle. Two types are specific to your heart muscle: cardiac troponin I (cTnI) and cardiac troponin T (cTnT). When heart muscle cells are damaged, they release these proteins into your blood.
Most hospitals now use a high-sensitivity troponin test (hs-cTnI or hs-cTnT). This can detect very small amounts of troponin. It picks up early or minor heart damage much sooner than older tests could.
What your results mean
A troponin result alone cannot confirm or rule out a heart attack. Your doctor will look at your result alongside your symptoms, your ECG, and any imaging tests. It is the pattern of results over time that matters most.
If your troponin is high and rising
A troponin level that increases significantly between your first and second blood test strongly suggests a heart attack has occurred. This means part of your heart muscle has been damaged due to a blocked blood vessel.
Your doctor will explain what this means for you and discuss your treatment options. In a heart attack, prompt treatment is essential.
If your troponin is high but stable (not rising)
A raised troponin that stays at the same level — rather than rising — is less likely to mean a heart attack is happening right now. Your doctor will look for other possible causes.
These can include:
- myocarditis (inflammation of the heart muscle)
- acute heart failure
- an arrhythmia (abnormal heart rhythm)
- a pulmonary embolism (a blood clot in the lung)
- a stroke
- a serious chest injury
- long-term conditions such as heart failure, high blood pressure, kidney disease, or severe infection
If your troponin is normal
A normal and stable troponin result is reassuring. If you have chest pain from a known heart condition such as stable angina, a normal troponin suggests your heart muscle has not been damaged this time.
Your doctor will still want to understand what is causing your symptoms. They will work with you to decide on any further tests or monitoring you might need.
Questions to ask your doctor
What happens next
If your results suggest a heart attack, your medical team will act quickly. They will explain your treatment options and what to expect next.
If your results are reassuring, your doctor will still want to find out what caused your chest pain. They may recommend further tests or refer you to a specialist.
What can affect your results
Troponin is highly specific to heart muscle. Damage to other muscles in your body — from injections, accidents, or certain medicines — does not normally affect your troponin level.
Other tests you might need
Your doctor will use several tests together to build a clear picture. These may include:
- an ECG to look at your heart’s electrical activity
- a chest X‑ray
- an echocardiogram (an ultrasound scan of your heart)
- blood pressure and oxygen level checks