Troponin T Unit Converter
Troponin T Unit Converter
0.014 ng/mL and 14 ng/L are the same number. Convert cardiac troponin T between ng/L, pg/mL, ng/mL and µg/L — and see why a mildly raised troponin T means something different from a mildly raised troponin I.
Troponin T converter
Mass ladder onlyCardiac troponin T 25 ng/L
The four units and how they relate
ng/mL = µg/L
ng/mL = ng/L ÷ 1000
0.014 ng/mL = 14 ng/L
- ng/L = pg/mL
- a nanogram per litre and a picogram per millilitre are the same concentration. High-sensitivity troponin T is reported in these
- ng/mL = µg/L
- identical to each other and one thousand times larger than ng/L. Older reports and much of the literature before high-sensitivity assays use these
- the thousandfold trap
- 0.014 ng/mL and 14 ng/L are one result. A decimal in the hundredths is almost always ng/mL; a whole number in the tens is almost always ng/L — but confirm against the unit printed on the report rather than inferring it
- no molar unit
- troponin T is measured against an assay calibrator rather than a defined molar standard, so no nmol/L or pmol/L figure exists in clinical use. A molar conversion for troponin is always a mistake
Worked example
Cardiac troponin T 25 ng/L
25 ng/L = 25 ng/L = 25 pg/mL
25 ÷ 1000 = 0.025 ng/mL = 0.025 µg/L
This is above every published 99th-centile limit for the assay, and by itself it says only that there is myocardial injury — not what caused it
In someone with chronic kidney disease or a skeletal myopathy a stable value in this range is common and often chronic. The change between two samples, not this number, separates acute injury from chronic elevation
The four units
| Unit | Relationship | 25 ng/L is |
|---|---|---|
| ng/L | The high-sensitivity reporting convention | 25 |
| pg/mL | Numerically identical to ng/L | 25 |
| ng/mL | ng/L ÷ 1000 | 0.025 |
| µg/L | Numerically identical to ng/mL | 0.025 |
One assay, three published 99th centiles
| Source | Overall | Women | Men |
|---|---|---|---|
| Roche Elecsys Troponin T hs method sheet | 14 ng/L | 9.0 ng/L | 16.8 ng/L |
| Lehmacher et al, four-assay head-to-head, 2024 | — | 9 ng/L | 15.5 ng/L |
| UW Medicine laboratory test guide | — | 14 ng/L | 22 ng/L |
A thousandfold trap, and a protein that behaves differently from troponin I
Start with the units, because this is where results go wrong. Nanograms per litre and picograms per millilitre are the same concentration. Nanograms per millilitre and micrograms per litre are also the same as each other, and are a thousand times larger. A troponin T of 0.014 ng/mL and a troponin T of 14 ng/L are one identical result. High-sensitivity assays report in ng/L, most of the older literature and many international reports use ng/mL, and carrying a threshold across from one convention to the other without checking is a thousandfold error that can invent a myocardial infarction or miss one.
This page prints no reference interval, and that is deliberate. The decision level is the 99th percentile upper reference limit of a healthy population, and both the Fourth and the 2026 Fifth Universal Definitions of Myocardial Infarction require sex-specific limits, because using a single limit systematically under-recognises myocardial injury in women. High-sensitivity troponin T is measured on one manufacturer’s platform, so there is effectively one assay — and even then the published limit varies with the reference population studied, from 9.0 ng/L for women and 16.8 ng/L for men on the manufacturer’s own method sheet, to 9 and 15.5 in a published head-to-head comparison, to 14 and 22 in one hospital laboratory’s validated figures. The number you need is the one on your report.
Two things are specific to troponin T rather than troponin I, and they change how a mildly raised value should be read. It is more often raised in chronic kidney disease: troponin I has been observed to be less affected by renal dysfunction and more specific for myocardial injury in that group. And it is raised in skeletal myopathies — in muscular dystrophies, inflammatory myopathies and other neuromuscular disease, cardiac troponin T is frequently elevated where troponin I is not, attributed to re-expression of cardiac troponin T isoforms in regenerating skeletal muscle and to assay cross-reactivity with them.
The practical consequence is that a modestly raised troponin T in someone with advanced kidney disease or a known myopathy is more likely to be chronic, and less likely to represent acute coronary disease, than the same number would be for troponin I. It is not a reason to ignore it — the same patients have genuinely high cardiovascular risk, and a raised troponin predicts events in them too. It is a reason to weigh the change between serial samples far more heavily than the absolute value. A rising or falling pattern across a repeat one to three hours later indicates acute injury; a stable value across two samples points to a chronic cause. And no troponin, at any concentration, diagnoses myocardial infarction by itself: that needs evidence of ischaemia — symptoms, the ECG, imaging or angiography — alongside the biochemistry.
Frequently asked questions
Is 0.014 ng/mL the same as 14 ng/L?
Yes, they are the identical result. One nanogram per millilitre is a thousand nanograms per litre, µg/L is the same as ng/mL, and pg/mL is the same as ng/L. Confusing the conventions is a thousandfold error and the commonest mistake made with troponin results.
What is the normal range for troponin T?
There is no single figure this page can safely print. The decision level is the 99th percentile of a healthy population, and even for this one assay published limits range from 9.0 to 14 ng/L in women and 15.5 to 22 ng/L in men depending on the reference population studied. Use the limit your reporting laboratory publishes.
Why is troponin T often raised in kidney disease?
Because troponin T is more affected by renal dysfunction than troponin I, which is the more specific of the two for myocardial injury in chronic kidney disease. Reduced clearance plus genuine chronic myocardial injury both contribute. A stable raised value across serial samples suggests a chronic cause; a rising or falling one does not.
Can a muscle disease raise troponin T?
Yes. Cardiac troponin T is frequently raised in muscular dystrophies, inflammatory myopathies and other neuromuscular disease, where troponin I usually is not. This is attributed to re-expression of cardiac troponin T isoforms in regenerating skeletal muscle and to assay cross-reactivity with them, and it is a well-recognised cause of a puzzling raised troponin T.
Is troponin T interchangeable with troponin I?
No. They are different proteins measured by different assays with different 99th-centile limits, and they behave differently in renal disease and skeletal myopathy. A troponin T value must never be read against a troponin I threshold, and a patient’s results should be trended on the same assay throughout.
Related calculators
References
- Thygesen K, Alpert JS, Jaffe AS, et al. Fourth Universal Definition of Myocardial Infarction (2018). Circulation. 2018;138(20):e618–e651.
- Joint ESC/ACC/AHA/WHF Task Force for the Universal Definition of Myocardial Infarction. Fifth Universal Definition of Myocardial Infarction (2026). Circulation. 2026. doi:10.1161/CIR.0000000000001477.
- Roche Diagnostics. Elecsys Troponin T hs method sheet (09315357190). Accessed 2026.
- Rittoo D, Jones A, Lecky B, Neithercut D. Elevation of cardiac troponin T, but not cardiac troponin I, in patients with neuromuscular diseases: implications for the diagnosis of myocardial infarction. J Am Coll Cardiol. 2014;63(19):2411–2420.
- Jaffe AS, Vasile VC, Milone M, Saenger AK, Olson KN, Apple FS. Diseased skeletal muscle: a noncardiac source of increased circulating concentrations of cardiac troponin T. J Am Coll Cardiol. 2011;58(17):1819–1824.
- Lehmacher J, Sörensen NA, Twerenbold R, et al. Diagnostic and prognostic value of the sex-specific 99th percentile of four high-sensitivity cardiac troponin assays in patients with suspected myocardial infarction. Eur Heart J Acute Cardiovasc Care. 2024;13(1):3–12.
Medical Disclaimer: The tools and content provided here are for educational and reference purposes only. They are not intended to substitute for professional medical advice, diagnosis, or treatment. Clinical decisions should always be based on the comprehensive assessment of a qualified healthcare professional.