Urine Creatinine-to-Creatinine Clearance Ratio (24-hour urine collection)
This test measures how well your kidneys filter waste products from your blood over a 24-hour period using urine samples. It helps assess kidney function and blood flow to the kidneys.
["This test evaluates kidney efficiency by comparing urine waste to blood waste over a full day."]
Key facts at a glance
- LOINC
- 73917-7
- Short code
- JWH-250 4/5-OH-pentyl Ur Ql Cfm
- Synonyms
- JWH-250 4/5-OH-pentyl Ur Ql Cfm
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- confirm
- 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 Is Done
Your doctor may order this test if you have symptoms like frequent urination, swelling in your legs, high blood pressure, or if you have a history of kidney disease. It may also be used to check kidney function before certain surgeries or treatments.
How the Test Works
You’ll collect all urine for 24 hours in a special container. The test measures creatinine levels in both your urine and blood to calculate how well your kidneys remove waste from your bloodstream.
Sample Collection Process
Start collecting urine immediately after waking up (do not use the first morning urine). Empty your bladder, then collect every drop for 24 hours. Store urine in a cool place and return it to your lab on the same day. Avoid foods like red meat or caffeine that may affect results.
What to Expect Before the Test
No special preparation is needed, but drink plenty of water unless instructed otherwise. Avoid medications that may affect kidney function unless approved by your doctor.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Low results may indicate poor kidney function or blockages in the urinary tract, while high results could suggest dehydration, high blood pressure, or conditions like diabetes. This test helps diagnose and monitor kidney disease, blood pressure issues, and other health problems affecting kidney function.
Short name
Urine Creatinine Clearance Ratio
Frequently asked questions
How long does it take to get results?
What causes abnormal results?
Can I drink alcohol before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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