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Troponin I
Abbreviation: cTnI
Panel: Heart (Cardiac) Markers · All heart markers tests
Typical adult reference range
| Conventional units | ≤0.04 ng/mL |
| SI units | ≤40 ng/L |
Ranges vary between laboratories and methods — compare your result with the range printed on your own report.
What a high or low result can mean
High troponin i: high values can be seen in myocardial injury, including myocardial infarction, myocarditis, and severe strain on the heart.
These are associations, not a diagnosis: the same result can have several causes, and your clinician interprets it with the rest of your results and history.
Good to know
Values are assay-specific; high-sensitivity assays report in ng/L with different cut-offs, usually the 99th percentile upper reference limit.
Related tests — Heart (Cardiac) Markers
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.