Cardiac Troponin I, Serum (High Sensitivity)
This test measures a protein released when your heart muscle is damaged, often due to a heart attack or other heart stress. It helps doctors assess whether you’re at risk for serious heart problems.
["This test can detect early heart damage, even before symptoms appear."]
Key facts at a glance
- LOINC
- 102080-9
- Short code
- CARTBLD
- Synonyms
- CAR-T cell BPU
- Category
- chemistry
- Sample
- whole-blood
- Container
- Sterile, closed-system cell product bag (e.g., CryoStore or equivalent cryogenic storage bag) or manufacturer-supplied infusion bag; transported in validated temperature-controlled shipper
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 0–120 years
- Method
- Flow cytometry with immunophenotyping using CD3, CD4, CD8, and CAR-specific marker antibodies; may include quantitative PCR (qPCR) for CAR transgene detection and viability assessment via 7-AAD or trypan blue exclusion
- CPT
- 0537T (Chimeric antigen receptor T-cell (CAR-T) therapy; collection, processing, and preparation of cells for administration); additional flow cytometry codes (88184, 88185) may apply for cell counting
- SNOMED
- 116859006 (Transfusion of blood product) and 118757001 (Cellular therapy procedure); product-specific SNOMED codes vary by CAR-T construct
- Specimen volume
- Variable; typically the entire CAR-T cell product bag volume (10-100 mL for fresh products; cryopreserved bags reconstituted per protocol). Minimum sample volume for quality testing: 1-5 mL aliquot.
- Stability
- Fresh product: stable at 2-8°C for up to 72 hours post-manufacture (product-specific). Cryopreserved product: stable at ≤-150°C (vapor phase liquid nitrogen) for long-term storage. Post-thaw viability decreases over time; infuse within manufacturer-specified window (typically 2-4 hours at room temperature).
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–72 hours
- Order
- routine
Why This Test Matters
Cardiac troponin I is a key marker for heart injury. When heart cells are damaged—such as during a heart attack—their contents, including troponin I, leak into the bloodstream. Detecting elevated levels can signal acute myocardial infarction (heart attack) or other conditions like unstable angina, myocarditis, or severe heart strain. High-sensitivity testing improves early detection, allowing for quicker medical intervention if needed.
What to Expect Before the Test
No special preparation is needed for this test. You’ll have a small needle inserted into your arm or hand to draw a blood sample. The process is quick and usually painless. If you’re on blood thinners, let your healthcare provider know before the test.
How the Test Works
Blood is drawn and sent to a lab, where it’s analyzed using a highly sensitive immunoassay method. This test measures tiny amounts of troponin I in your serum, even when levels are just slightly elevated. Results are compared to a reference range to determine if your levels are within normal limits or elevated.
What the Results Mean
If your troponin I levels are normal, it suggests your heart is functioning well without recent damage. If levels are elevated, your doctor may investigate further to rule out heart issues like a heart attack, heart failure, or other cardiac stress. Follow-up tests or imaging may be needed to understand the cause.
Reference range
Product release criteria are defined per manufacturing specification; minimum acceptable CAR-T cell dose, viability ≥70%, and transduction efficiency per lot release certificate. Reference ranges not applicable for blood product unit testing as each product batch has individualized release criteria.N/A
Patient preparation is not applicable as testing is performed on the manufactured CAR-T cell blood product unit, not the patient directly. Patient apheresis collection prior to manufacturing requires standard cell therapy protocols.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
hs-cTnI
Frequently asked questions
What causes elevated troponin I levels?
How soon after a heart attack will this test show results?
Can false-positive or false-negative results happen?
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