Plasma/Serum Creatinine-to-Creatinine Clearance Ratio (Creatinine Clearance Ratio)
This test measures how well your kidneys filter waste products from your blood, using creatinine levels and urine flow. It helps assess kidney function and blood flow to the kidneys.
["Assesses kidney function and blood flow by evaluating creatinine clearance."]
Key facts at a glance
- LOINC
- 47895-8
- Short code
- GH 1h p Orn SerPl-aCnc
- Synonyms
- GH 1h p Orn SerPl-aCnc
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 0
- Ref high
- 17
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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 problems, such as swelling, fatigue, or changes in urine output. It may also be used to monitor kidney function in people with diabetes, high blood pressure, or other conditions that affect the kidneys.
What to Expect Before the Test
No special preparation is usually needed. You may be asked to provide a urine sample and a blood sample. If you’re taking certain medications, let your doctor know before the test.
How the Test Works
Creatinine is a waste product naturally produced in your blood. Your doctor measures your creatinine levels in a blood sample and estimates how much urine you produce over time to calculate your creatinine clearance. This ratio helps determine how well your kidneys are filtering waste.
Possible Results and Interpretation
A lower than expected creatinine clearance may indicate poor kidney function or reduced blood flow to the kidneys. Higher than expected results could suggest dehydration or other conditions affecting kidney function.
Reference range
NCBI: NSE 0-17 ng/mLN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Creatinine Clearance Ratio
Frequently asked questions
What does a low creatinine clearance mean?
How often should I get this test?
Is there any risk or discomfort with 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 17, 2026. · Read our editorial policy