Cardiac Troponin I, Serum (High-Sensitivity)
This test measures a protein released into your blood after heart muscle damage, helping doctors assess heart injury or risk of heart attack.
["High sensitivity helps detect even small heart damage for early warning or treatment planning."]
Key facts at a glance
- LOINC
- 30901-3
- Short code
- COLDAG
- Synonyms
- CA Titr SerPl Cord RBC Aggl
- Category
- chemistry
- Sample
- serum
- Container
- Serum separator tube (SST) or red-top tube, pre-warmed to 37°C
- Units
- N/A
- Ref low
- 0
- Ref high
- 1
- Critical range
- 2 N/A – 7 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- aggl-cord-rbc
- CPT
- 86156
- SNOMED
- 35825006
- Specimen volume
- 3-5 mL of whole blood; minimum 1 mL serum required
- Stability
- Serum should be separated at 37°C within 1 hour of collection. Stable at 37°C for 4 hours; for longer storage, freeze at -20°C. Do not refrigerate specimen as cold exposure causes false-positive agglutination.
- Hemolysis max
- 100
- Lipemia max
- 200
- Icterus max
- 50
- TAT
- 24–72 hours
- Order
- routine
Why This Test Is Done: Your healthcare provider has ordered this test to help evaluate your overall health, check how well certain organs or body systems are working, screen for possible medical conditions, and guide decisions about your ongoing care and treatment.
Your doctor may order this test if you have symptoms like chest pain, shortness of breath, or heart-related concerns, or if you’re at higher risk for heart problems. It’s also used in monitoring heart patients or after a suspected heart attack.
What to Expect Before the Test: Before your test, your healthcare provider or the clinic staff will explain the procedure and answer any questions you may have. You should tell them about all prescription medicines, vitamins, herbal products, and supplements you take, along with any allergies or existing health conditions, so they can prepare you properly.
No special preparation is needed, but avoid strenuous activity 24 hours before. If you’re on blood thinners, tell your lab team beforehand.
What the Results Mean: Your test results will be reviewed by your healthcare provider, who will explain what the values mean in the context of your symptoms, medical history, and overall health. Results that fall within the typical reference range are considered normal, while values outside that range may point to a condition that needs further evaluation, monitoring, or treatment.
Elevated levels may indicate recent heart damage, while normal results suggest no recent injury. Results are interpreted by your healthcare provider based on your symptoms and medical history.
Common Reasons for Abnormal Results: Abnormal results can have many causes, including underlying medical conditions, recent or current illness, dehydration, stress, certain medications or supplements, lifestyle factors, or problems with how the sample was collected or handled. Your healthcare provider will look at the full picture, including your symptoms and other test findings, before drawing any conclusions.
False elevations can occur with kidney disease, muscle injury, or infections. False negatives may happen if tested too soon after injury or if levels are very low.
Reference range
Negative or titer <1:32 at 4°C. Titers ≥1:64 are considered clinically significant and may indicate cold agglutinin disease, Mycoplasma pneumoniae infection, or other cold-reactive autoimmune hemolytic conditions.N/A
No fasting required. Specimen should be collected and transported at 37°C to prevent in vitro cold agglutinin adsorption to red blood cells, which can cause false-negative results. Avoid exposure to cold temperatures during and immediately after collection.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
High-sensitivity cardiac troponin I is critical for diagnosing acute myocardial infarction (heart attack), guiding treatment decisions, and assessing long-term heart health. It helps differentiate between heart-related and non-heart-related symptoms, improving patient outcomes by tailoring care early.
Short name
hs-cTnI (serum)
Frequently asked questions
How long does it take to get results?
Can I eat or drink before this test?
Does this test require fasting?
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 17, 2026. · Read our editorial policy