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Cardiac Troponin I (Serum) with High-Sensitivity Measurement

Published: August 9, 2026Updated: August 16, 2026

This test measures a protein released by heart muscle cells when they are damaged, often used to detect or monitor heart attack risk.

Quick summary

["Helps identify heart damage or risk of a heart attack with high sensitivity."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
88712-5
Short code
Lipase DiafP-cCnc
Synonyms
Lipase DiafP-cCnc
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
10
Critical range
— – 1000 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82105
SNOMED
394971007
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

Cardiac troponin I is a protein found in healthy heart muscle. When heart tissue is injured—such as during a heart attack—the protein leaks into your bloodstream. Detecting it helps doctors diagnose heart problems, assess severity, or guide treatment decisions.

How the Test Works

Your blood sample is tested using a highly sensitive method to detect even small amounts of troponin I. This helps identify early signs of heart muscle damage, even if symptoms aren’t yet obvious.

Common Reasons for This Test

Doctors may order this test if you have chest pain, shortness of breath, or other symptoms suggesting a heart issue. It’s also used in monitoring heart health after a diagnosis like a heart attack or heart failure.

What to Expect Before the Test

No special preparation is needed, but inform your doctor about recent injuries, infections, or medications (like blood thinners) that could affect results.

Reference range

Normal: <10 ng/mLN/A

Specimen: serum

No special preparation required. For PSA, avoid sexual activity for 24-48 hours before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

hs-cTnI (Serum)

Frequently asked questions

What does a positive result mean?
A positive result means your blood contains higher-than-normal troponin levels, which may indicate recent or ongoing heart damage. Your doctor will review the result alongside your symptoms and medical history to determine next steps.
Can stress or exercise cause a false positive?
Strenuous exercise or severe stress can temporarily raise troponin levels, but high-sensitivity testing helps distinguish true heart damage from these effects. Your doctor will consider the timing and context of your symptoms.
How long does it take to get results?
Results are typically available within 24 to 48 hours, depending on lab processing times. Follow-up with your healthcare provider to discuss findings and next steps.
  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 16, 2026. · Read our editorial policy