Cardiac Troponin I (Serum) with Calculated Ratio to High-Sensitivity Troponin T
This test measures two heart muscle proteins (troponin I and troponin T) in your blood to assess damage to heart tissue, often used to evaluate recent heart attack risk or other cardiac conditions.
["Helps doctors determine if your heart has been injured and guides treatment decisions."]
Key facts at a glance
- LOINC
- 72564-8
- Short code
- CK MB CFr.DF SerPl Calc
- Synonyms
- CK MB CFr.DF SerPl Calc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 22
- Ref high
- 198
- Critical range
- — – 10000 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- calculated
- CPT
- 82553
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters for Your Health
Troponin is a protein released when heart muscle cells are damaged, such as during a heart attack. High levels can signal recent or ongoing heart injury, even if symptoms aren’t obvious. This test helps doctors monitor your heart’s condition and adjust care plans accordingly.
When You Might Need This Test
You may have this test if you have chest pain, shortness of breath, or other symptoms that could indicate heart problems. It’s also used in patients 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 blood draw, usually from your arm, and the sample will be sent to a lab for analysis. The test may be done at a clinic, hospital, or your doctor’s office.
What the Results Mean
Results compare two troponin levels: troponin I and troponin T. A calculated ratio helps doctors assess the severity of heart damage more precisely. While high levels often mean heart injury, results alone don’t diagnose conditions like heart attack without clinical correlation.
Reference range
Adult males: 22-198 U/L; Females: 22-198 U/LN/A
No special preparation required. Inform provider of any chest pain or symptoms.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Cardiac Troponin Ratio (Serum)
Frequently asked questions
How long does it take to get my results?
Can I eat or drink before this test?
Will this test show if I have a heart attack?
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