Metabolic
Troponin I
LOINC 67151-1 · ng/L
Ranges
Reference range: ≤ 14 ng/L
What it is
Troponin I is a protein released into the blood when heart muscle is injured. It is the main blood test used to detect a heart attack.
Why it matters
Even small rises are meaningful, making troponin central to evaluating chest pain and heart muscle damage.
What high values can mean
A higher value indicates heart-muscle injury, classically a heart attack but also other strains on the heart.
What low values can mean
A lower or undetectable value makes recent significant heart-muscle injury unlikely.
How to improve it
Troponin reflects an acute event; prevention focuses on overall heart health and managing risk factors.
Food & lifestyle
A heart-healthy lifestyle lowers long-term risk, but troponin itself is about detecting injury, not daily habits.
Preparing for the test
Usually drawn urgently when a heart problem is suspected; no fasting is required.
When to talk to a doctor
Seek emergency care for chest pain or pressure; a raised troponin needs urgent medical evaluation.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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