Urine Creatinine-to-Creatinine Clearance Ratio (or Urine Flow Rate Monitoring)
This test helps assess how well your kidneys are filtering waste products and fluids through urine output over time. It may be used to evaluate kidney function or diagnose conditions affecting urine production.
["This test helps doctors check how efficiently your kidneys process waste and fluids by measuring urine output patterns."]
Key facts at a glance
- LOINC
- 26234-5
- Short code
- MR UE-R
- Synonyms
- MR UE-R
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- mr
- 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 healthcare provider may order this test if you have symptoms like frequent urination, dehydration, or signs of kidney issues. It can also be used during certain medical procedures or to monitor chronic conditions affecting urine flow.
What to Expect Before the Test
No special preparation is needed unless instructed. You may be asked to collect urine samples over a specified period (e.g., 24 hours) or provide a single sample while monitoring urine output. Staying hydrated but avoid excessive fluid intake unless advised otherwise.
How the Test Works
Urine is collected and analyzed to measure its volume and waste products (like creatinine) over time. The ratio or flow rate helps determine kidney function and fluid balance. Some tests may use specialized equipment to measure urine output continuously.
Common Conditions Monitored
This test is often used to diagnose or monitor conditions like urinary tract obstructions, kidney diseases, dehydration, or conditions affecting fluid balance (e.g., diabetes insipidus). It may also be part of pre-surgery evaluations or ongoing management of chronic kidney disease.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Urine Flow Rate Test
Frequently asked questions
What does an abnormal urine flow rate or creatinine ratio mean?
How long does it take to get results?
Can I drink fluids 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