Cardiac Troponin I (High Sensitivity) – Blood Test
This blood test measures a protein called cardiac troponin I, which appears only in heart muscle cells. It helps doctors detect heart damage, such as from a heart attack, even if symptoms are mild or delayed.
["This test helps identify if your heart has been damaged, often from a heart attack, even without obvious symptoms."]
Key facts at a glance
- LOINC
- 78979-2
- Short code
- CATHGW
- Synonyms
- Cath device Guide wire prod name
- Category
- chemistry
- Sample
- serum
- Container
- Not applicable; this entry documents device product information rather than a biological specimen test.
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- Not applicable
- Stability
- Not applicable
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Doctors order this test when you have symptoms like chest pain, shortness of breath, or other signs of heart trouble. It may also be used in people with risk factors for heart disease, like high blood pressure or diabetes, to check for silent damage.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw blood. It usually takes about 15 minutes. Avoid strenuous activity for 24 hours before the test if you’re at higher risk for heart issues.
What the Results Mean
Results show the level of troponin I in your blood. Elevated levels suggest recent heart damage, but interpretation depends on your symptoms and medical history. Your doctor will discuss these results with you.
Common Causes of Abnormal Results
High troponin levels can occur after heart attacks, heart surgery, or severe heart strain. They may also appear in conditions like kidney disease, muscle injuries, or certain infections, though these are less common.
Reference range
Not applicable; this LOINC code represents identification of a catheterization device guide wire product and does not have a numeric reference range.N/A
No patient preparation required for documentation of guide wire product used during catheterization procedures.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
hs-cTnI
Frequently asked questions
What does a positive troponin test mean for me?
Can I still exercise if I have a troponin test?
How soon will I get my results?
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