TnI
Medical abbreviation · Cardiology
| Stands for | Troponin I |
|---|---|
| Categories | Medical |
TnI stands for Troponin I, a cardiology abbreviation.
Cardiac-specific protein released into the blood when heart muscle cells are damaged, the most widely used test for diagnosing myocardial infarction. Levels begin rising within hours of injury and can stay elevated for 7 to 10 days.
Example: TnI 0.03 at arrival and 2.4 at 3 hours with new ST depression: NSTEMI.
Usage notes
Many manufacturers produce troponin I assays and results are not interchangeable, so serial values should come from the same lab. Elevated troponin is not specific to heart attack: myocarditis, pulmonary embolism, sepsis, kidney failure and strenuous exercise also raise it. Units vary between ng/mL for older assays and ng/L for high-sensitivity tests.
Related abbreviations
More cardiology abbreviations
- TdP – Torsades de pointes (twisting of the points)
- TEE – Transesophageal echocardiogram
- TEER – Transcatheter edge-to-edge repair
- TEVAR – Thoracic endovascular aortic repair
- TGA – Transposition of the great arteries
- TIMI – Thrombolysis in Myocardial Infarction
- TnT – Troponin T
- TOF – Tetralogy of Fallot
- TR – Tricuspid regurgitation
- TTE – Transthoracic echocardiogram
- TTS – Takotsubo syndrome
- UA – Unstable angina
See all 229 cardiology abbreviations →
This entry is for general education and is not medical advice. Abbreviation use varies between institutions; always confirm in context.