Cardiac Troponin I (High-Sensitivity) - Serum
This test measures a protein released when your heart muscle is damaged, often due to a heart attack. It helps doctors determine if you’ve had or are at risk for heart injury.
["This test helps assess heart health and detect potential heart damage quickly."]
Key facts at a glance
- LOINC
- 74041-5
- Short code
- t(ABL1,BCR)p210/cntrl.0.1% p Tx Bld/T Ql
- Synonyms
- t(ABL1,BCR)p210/cntrl.0.1% p Tx Bld/T Ql
- Category
- coagulation
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- molgen
- CPT
- 86140
- SNOMED
- 396252006
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
What Does This Test Measure?
Your blood sample contains a specific protein called cardiac troponin I (hs-cTnI), which is produced by heart muscle cells. When these cells are damaged—such as during a heart attack—the protein leaks into your bloodstream. This test detects very small amounts of this protein to identify heart injury.
Why Is This Test Done?
Doctors order this test to evaluate symptoms like chest pain, shortness of breath, or other signs of heart problems. It may also be used in people with risk factors for heart disease, like high blood pressure or diabetes, to monitor heart health over time.
How Is the Test Performed?
A small blood sample is taken from a vein in your arm. The sample is sent to a lab where it is analyzed using a highly sensitive method to detect even tiny amounts of cardiac troponin I.
What Are Common Reasons for This Test?
Common reasons include diagnosing a heart attack, checking for signs of heart muscle damage after a suspected event, or monitoring heart health in people with known heart conditions.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: This test is critical for diagnosing acute myocardial infarction (heart attack) and assessing the extent of heart damage. Elevated levels can indicate recent or ongoing heart injury, guiding treatment decisions and guiding follow-up care.
Short name
hs-cTnI
Frequently asked questions
How long does it take to get results from this test?
Can lifestyle changes affect my troponin levels?
What if my troponin levels are elevated?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy