Lab tests
Troponin and cardiac marker test explainer
Cardiac marker reports are confusing because the same test comes in several versions with different units: troponin I or troponin T, standard or high-sensitivity, ng/L or ng/mL, often repeated a few hours apart. Add your report below to see each line named, with its time, its value and the cut-off your laboratory printed.
Explain your troponin and cardiac marker test
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What you get
- Each marker on its own row, with repeat samples listed in time order.
- The version of the test identified: troponin I or T, and high-sensitivity where the report says so.
- Units and the printed cut-off restated, including what '99th percentile' refers to.
- Questions to ask the team that ordered the tests.
Lines you may see on a cardiac marker report
- Troponin I (cTnI) and troponin T (cTnT)Two proteins found in heart muscle cells; a laboratory measures one or the other
- High-sensitivity troponin (hs-cTn)A version of the test that can measure much smaller amounts
- 0 h, 1 h, 3 h or serial samplesThe same test repeated at set times
- Delta or changeThe difference between two troponin results
- 99th percentile URLThe upper reference limit the laboratory uses for its own troponin test
- CK-MBA form of the enzyme creatine kinase found mostly in heart muscle
- BNP and NT-proBNPTwo related substances released by the heart, reported in pg/mL or ng/L
What this tool cannot tell you
Troponin numbers are not comparable between troponin I and troponin T or between different makers' tests, so a value only has meaning beside the limit printed on the same report. Doctors read these markers together with symptoms, an ECG and the change between samples, none of which this tool can see. MedicDecode explains the lines and units and does not say whether a result shows a heart problem. Never use it to decide whether symptoms are serious: if you have chest pain or feel very unwell, call your local emergency number.
Common questions
Why was my troponin measured two or three times?
Reports often show the same test at set intervals, labelled 0 h, 1 h or 3 h, with the difference between them given as a delta. The team compares the results over time as well as looking at each one. They can tell you what they concluded from the series.
What does 99th percentile mean beside the reference?
It describes how the laboratory set the upper reference limit for its troponin test, using results from a reference group of people. The figure is specific to that test and may be printed separately for men and women. It is the limit your result is flagged against on the report.
Are BNP and NT-proBNP the same test?
They are related but not interchangeable. The two are measured by different tests and reported on different scales, so each has its own reference values. The explanation uses the one named on your report.
Words you may see on this report
Tap a word for its plain-English meaning, an example line and what it does not mean.
- Troponin
Troponin is a protein released into the blood when heart muscle is damaged; it is a main blood test used to check for heart attacks.
- ALT (Alanine Aminotransferase)
ALT is an enzyme found mainly in the liver; when liver cells are irritated or damaged, more ALT leaks into the blood.
- AST (Aspartate Aminotransferase)
AST is an enzyme found in the liver, muscles, heart and other tissues; raised levels can signal stress or damage in one of these.
- Bilirubin
Bilirubin is a yellow substance made when old red blood cells break down; the liver processes it so it can leave the body.
- Creatinine
Creatinine is a waste product from normal muscle activity that the kidneys filter out, so its blood level helps show how well the kidneys work.
- CRP (C-Reactive Protein)
CRP is a protein made by the liver that rises quickly when there is inflammation or infection in the body.
- Culture and Sensitivity
A culture and sensitivity test grows germs from a sample to identify them, then checks which antibiotics can stop them.
- eGFR (Estimated Glomerular Filtration Rate)
eGFR is an estimate of how well your kidneys filter waste from your blood, calculated from a creatinine blood test plus details like age.
- Electrolytes
Electrolytes are minerals in the blood, such as sodium, potassium and chloride, that carry an electric charge and help the body work.
- ESR (Erythrocyte Sedimentation Rate)
ESR measures how fast red blood cells sink in a tube of blood over an hour; a faster rate can be a general sign of inflammation.
- Fasting Sample
A fasting sample is blood taken after you have had nothing to eat or drink except water for a set number of hours.
- Ferritin
Ferritin is a protein that stores iron; its blood level gives a good idea of how much iron the body has in reserve.