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24-Hour Urinary Creatinine Clearance

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

This test measures how well your kidneys filter waste products over a 24-hour period by analyzing your urine and blood.

Quick summary

["Assesses kidney function by tracking how efficiently waste is removed from your blood."]

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

Key facts at a glance

LOINC
88304-1
Short code
Kappa LC 24h Ur Ql IFE
Synonyms
Kappa LC 24h Ur Ql IFE
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
immunofixation
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Matters for Your Health

Kidneys play a critical role in filtering waste and excess substances from your blood, including creatinine—a byproduct of muscle metabolism. This test helps doctors evaluate how well your kidneys are working to remove these waste products over time.

How the Test Works

You’ll collect all your urine for a full 24-hour period (starting and ending with a voided sample). Blood is drawn once to measure baseline creatinine levels. The test compares these values to estimate how much creatinine your kidneys filter daily.

What to Expect Before the Test

No special preparation is needed for the urine collection, but you may be asked to wear a collection bag or use a container. For blood draw, follow any fasting instructions your doctor provides.

Common Causes for Testing

Doctors may order this test if you have symptoms like frequent urination, swelling, fatigue, or if you’re at risk for kidney disease (e.g., due to diabetes, high blood pressure, or family history). It’s also used to monitor kidney function in chronic conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Low clearance may indicate kidney damage or disease, while abnormally high values could suggest conditions like dehydration or urinary tract blockages. This test helps doctors diagnose, monitor, or guide treatment for kidney-related issues or other systemic diseases.

Short name

24h Urine Cr Clearance

Frequently asked questions

What does a ‘normal’ result mean?
A result is interpreted by your doctor based on your overall health, age, and other factors. There’s no single ‘normal’ range for this test because it varies widely among individuals.
How often should I get this test?
Your doctor will determine how often you need this test based on your medical history, symptoms, and treatment plan. Regular monitoring may be recommended if you have chronic kidney disease or related conditions.
Can I eat or drink normally before the urine collection?
Yes, you can eat and drink as usual for the urine collection, as it measures waste removal over a full day. However, follow your doctor’s instructions for blood draw timing if included.
  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