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Cardiac Troponin I (cTnI) with 24-Hour Urine Collection for Creatinine Clearance

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

This test measures your heart muscle protein (troponin I) in your blood and evaluates how well your kidneys filter waste over 24 hours.

Quick summary

["Helps assess heart damage and kidney function together in one test."]

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

Key facts at a glance

LOINC
81880-7
Short code
TNNT2 Fam Mut Anl Bld/T
Synonyms
TNNT2 Fam Mut Anl Bld/T
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Matters for Your Heart Health

Troponin I is released when your heart muscle is damaged, often due to heart attacks or other stress. This test helps doctors determine if you’ve had recent heart injury.

How Your Kidneys Filter Waste (Creatinine Clearance)

Creatinine clearance measures how efficiently your kidneys remove waste from your blood. This helps assess kidney function and ensures your heart and kidneys work together properly.

What to Expect Before the Test

For the troponin part, you’ll have a blood draw. For the urine part, you’ll collect all urine for 24 hours in a special container. Follow your doctor’s instructions carefully.

What the Results Mean

High troponin levels may indicate heart damage, while abnormal creatinine clearance could signal kidney problems. Your doctor will interpret these results in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated troponin I can signal acute heart injury, while poor creatinine clearance may reflect kidney dysfunction. Together, these tests help identify risks for heart failure, kidney disease, or both, guiding treatment decisions.

Short name

cTnI + 24h CrCl

Frequently asked questions

What causes troponin I to rise in the blood?
Troponin I levels can rise due to heart attacks, severe heart strain (like heart failure), or other heart injuries. Stress from conditions like heart valve problems or infections may also trigger it.
How long does it take to get results?
Blood troponin results are usually ready within 24–48 hours. Urine creatinine clearance results may take 3–5 business days, depending on your lab.
Can I drink fluids before the urine collection?
Yes, but avoid excessive fluid intake (like sports drinks) that could dilute your urine. Follow your doctor’s specific instructions for the 24-hour period.
  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