Creatinine Clearance (from Urine and Blood)
This test measures how well your kidneys filter waste products from your blood, using both your urine and blood samples. It helps assess kidney function and blood flow to the kidneys.
["This test helps doctors check how well your kidneys are working and identify potential kidney problems early."]
Key facts at a glance
- LOINC
- 35917-4
- Short code
- CT Guided GB Drain+cath place
- Synonyms
- CT Guided GB Drain+cath place
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- ct
- 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 Done
Your doctor may order this test if you have symptoms of kidney disease, such as swelling, fatigue, or changes in urine output. It’s also used to monitor kidney function in people with diabetes, high blood pressure, or other health conditions that can affect the kidneys.
How the Test Works
Blood and urine samples are collected. Blood creatinine levels are measured to determine how much waste your kidneys remove, while urine creatinine and volume are measured to calculate how efficiently your kidneys filter blood.
Sample Collection
You’ll need to provide a 24-hour urine sample (collecting all urine over 24 hours) and a blood sample. Follow your doctor’s instructions carefully to ensure accurate results.
What to Expect
The blood draw is quick and usually done in a clinic or doctor’s office. The 24-hour urine collection requires collecting all urine for a full day, which may require planning around your schedule.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Low creatinine clearance may indicate kidney damage, poor blood flow to the kidneys, or other health issues. High values could suggest dehydration or other conditions affecting kidney function. This test is critical for diagnosing and managing chronic kidney disease, kidney stones, or other kidney-related disorders.
Short name
Urine Creatinine Clearance
Frequently asked questions
How long does it take to get results?
What does a low or high creatinine clearance mean?
Can I eat or drink anything 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