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Cardiac Troponin I (Serum) – Mass Concentration

Published: August 9, 2026Updated: August 17, 2026

This test measures the level of cardiac troponin I, a protein released when heart muscle is damaged.

Quick summary

["Troponin I helps identify heart injury, such as a heart attack."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
32673-6
Short code
CK MB SerPl-cCnc
Synonyms
CK MB SerPl-cCnc
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
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

What Is Cardiac Troponin I Used For?

Cardiac troponin I is primarily used to diagnose and monitor conditions affecting the heart, such as myocardial infarction (heart attack). It can also help assess the severity of heart damage or guide treatment decisions in patients with suspected heart issues.

How Is This Test Performed?

A blood sample is taken from a vein, usually in your arm. The sample is sent to a lab where it is analyzed to measure troponin I levels using a sensitive immunoassay method.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like chest pain, shortness of breath, or other signs of heart problems. It may also be used after a heart attack to track recovery or in patients with known heart disease for ongoing monitoring.

What Are Common Results and Interpretations?

Results are interpreted by your healthcare provider based on your symptoms, medical history, and other test results. Elevated levels may indicate recent or ongoing heart muscle damage, while normal levels suggest no significant heart injury.

Reference range

Adult males: 22-198 U/L; Females: 22-198 U/LN/A

Specimen: serum

No special preparation required. Inform provider of any chest pain or symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Cardiac Troponin I (Serum)

Frequently asked questions

How long does it take to get results from this test?
Results are typically available within 24 to 48 hours, depending on lab processing times and your healthcare provider’s workflow. Your provider will discuss the results with you during your follow-up visit.
Can lifestyle changes affect troponin I levels?
While lifestyle factors like diet, exercise, and smoking can impact heart health, troponin I levels are primarily a response to actual heart damage. Acute elevations are usually due to injury, while chronic, low-level elevations may be associated with conditions like heart failure or chronic stress on the heart.
Is this test painful?
No, drawing blood is a quick and relatively painless procedure. You may feel a slight pinch or sting when the needle is inserted, but most people describe it as mild discomfort that lasts only a few seconds.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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