Troponin: what it is, what it tells you and when it’s tested

Troponin is a protein inside the cells of the heart muscle. If the heart is damaged, it leaks into the blood. It is an emergency test: doctors read it, usually in hospital, together with your symptoms and an ECG. If you have chest pain, call 112 straight away. Do not wait for a blood test.

When it’s tested

Mostly in the emergency department, when someone has chest pain or other signs of a possible heart attack. The test is repeated after one or two hours, to see whether the value rises or falls.

Doctors also order it when they suspect inflammation of the heart, a pulmonary embolism or heart failure, after heart surgery and during some cancer treatments.

It is not a prevention test. In people who feel well, a single value without symptoms is hard to read and often leads to more tests without a real benefit. That is why Rosa does not test it. For heart risk over the years it looks at ApoB, LDL cholesterol, lipoprotein(a) and high-sensitivity CRP instead.

What it tells you, and what it does not

It shows whether the heart muscle has been damaged, now or in the days before. If it rises or falls between two tests, the damage is recent. If it stays high but stable, the damage is often slow and long-standing.

It does not show the cause. A heart attack is the most important one, but not the only one: inflammation of the heart, an embolism, heart failure or kidneys that work less well can raise it too.

A first normal value is not enough to rule out a heart attack if the pain started recently. That is why the test is repeated.

That is why it is read together with other tests:

Normal troponin levels

There is no single normal value. There are two kinds of troponin, I and T, and every method has its own limit. The limit is the value below which 99% of healthy people fall. Some methods have different limits for men and women.

Today almost every lab uses high-sensitivity troponin, in ng/L. Some reports still use µg/L: 1 µg/L equals 1000 ng/L.

What matters most to the doctor is how it changes between two tests, more than the single number. That is why the value has to be read by a doctor, together with your symptoms and an ECG.

If your troponin is high or low

What can change the result

A few things raise it without a heart attack. Doctors know them and take them into account.

When to worry

Call 112 or go to the emergency department if you have:

Frequently asked questions

What are normal troponin levels? It depends on the lab method, and sometimes on sex. The limit is printed on the report. The doctor mostly looks at whether the value changes between two tests.

What is high-sensitivity troponin? It is the method almost every hospital uses today. It picks up very small amounts, so heart damage is recognised sooner, with two tests one or two hours apart.

How soon does troponin rise in a heart attack? It starts to rise in the first hours and can stay high for several days. That is why the test is repeated if the pain started recently.

Troponin I or troponin T: what is the difference? They are two proteins from the same muscle and tell the same story. The limits and numbers differ, so they cannot be compared with each other.

Does Rosa test troponin? No. It is an emergency test, done in hospital. For heart risk over the years Rosa measures ApoB, LDL cholesterol, lipoprotein(a) and high-sensitivity CRP.

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