Troponin
Troponin is a structural protein of heart muscle. Elevated blood levels indicate cardiac muscle injury — the cornerstone test for diagnosing heart attack, but other causes exist.
What it measures
Troponin proteins (cTnI and cTnT) live inside cardiac muscle cells, organising the contractile apparatus. When heart muscle cells die or are injured, troponin leaks into the bloodstream. High-sensitivity troponin assays can detect injury within 1–3 hours of onset, making them the cornerstone of acute coronary syndrome diagnosis. Troponin is NOT a screening test for cardiovascular risk — it's used when chest pain or symptoms suggesting acute heart injury are already present.
What a high value can mean
- Acute coronary syndrome — heart attack; dynamic rise + clinical context.
- Heart failure decompensation — chronic mild elevation, not necessarily acute injury.
- Myocarditis, pericarditis — inflammation of the heart muscle or surrounding tissue.
- Pulmonary embolism — right ventricular strain.
- Severe sepsis — myocardial injury from systemic inflammation.
- Renal failure — chronic mild elevation; troponin clearance reduced.
- Strenuous exercise — transient.
- Cardiac trauma, defibrillation — mechanical injury.
What a low value can mean
- No cardiac muscle injury — the desired finding.
- Useful for ruling out heart attack when symptoms are equivocal and serial measurements remain low.
When to discuss with a doctor
Troponin is an emergency-department test, not a home tracker. Mediora.AI doesn't interpret troponin in isolation. Any chest pain, breathlessness, or symptoms suggesting heart attack — call an ambulance, not Mediora. Persistent mildly elevated troponin in a stable patient with known kidney or heart disease may not need acute action; a clinician interprets the trajectory.