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Elevated Cardiac Troponin I (Cardiac Troponin I, Cardiac Markers) – 24-Hour Urine Collection Probe

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

This test measures small amounts of troponin I, a protein released by damaged heart muscle, over a 24-hour period in your urine. It helps assess long-term heart injury or stress.

Quick summary

["This test detects heart muscle damage over time, aiding in chronic heart condition monitoring."]

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

Key facts at a glance

LOINC
87370-3
Short code
EC fasA gene Islt Ql NAA+probe
Synonyms
EC fasA gene Islt Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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 Is Used

Doctors may order this test if you have symptoms like chest pain, shortness of breath, or if you’re at risk for heart disease. It helps track whether your heart is healing properly after an event like a heart attack or heart surgery.

How the Test Works

A urine sample is collected over 24 hours to measure troponin I levels. This method helps detect small, ongoing heart damage that standard blood tests might miss.

Sample Collection

You’ll need to collect all urine for 24 hours in a special container. Drink normal fluids, but avoid medications that may affect results. Return the sample to your lab on the same day.

Preparation

No special preparation is needed, but avoid strenuous activity or medications that could alter results (like certain painkillers). Follow your doctor’s instructions carefully.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated troponin I in urine can indicate chronic heart damage, such as from high blood pressure, heart failure, or coronary artery disease. It’s less commonly used than blood troponin tests but may help in certain cases where blood tests are inconclusive.

Short name

Cardiac Troponin I Urine Probe

Frequently asked questions

What does a positive result mean?
A positive result suggests possible chronic heart muscle damage or stress. Your doctor will review your symptoms and other test results to determine the cause and next steps.
Can this test replace a blood troponin test?
No, this test is different from blood troponin tests. It measures troponin I in urine over time, which may help detect subtle, ongoing heart damage that isn’t visible in a single blood test.
How often should this test be repeated?
Your doctor will decide based on your condition. Repeat tests may be needed if you have ongoing heart symptoms or risk factors.
  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