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Urine Creatinine-to-Creatinine Clearance Ratio (or Urine Flow Rate Monitoring)

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

This test measures how efficiently your kidneys filter waste products from your blood through urine output over time. It helps assess kidney function and fluid balance.

Quick summary

["This test helps doctors check if your kidneys are working properly and if you’re retaining too much fluid."]

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

Key facts at a glance

LOINC
33020-9
Short code
Tri-Phos Cry #/area UrnS LPF
Synonyms
Tri-Phos Cry #/area UrnS LPF
Category
electrolyte
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microscopy-light-lpf
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 swelling, frequent urination, or signs of kidney problems. It can also be used to monitor long-term conditions like diabetes or heart failure.

How the Test Works

You’ll likely drink water beforehand and collect urine samples over a set period (often 24 hours). The test measures how much urine you produce and the concentration of waste products in it.

Sample Collection Process

You’ll follow specific instructions to collect urine in a container for the full period. Some tests may require timed samples, while others measure continuous output. Your healthcare provider will guide you.

What to Expect After the Test

Results may take a few days to process. You’ll receive a report from your doctor, who will explain any findings in relation to your health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test helps diagnose or monitor conditions affecting kidney function, fluid balance, or urinary tract health. Abnormal results may indicate dehydration, kidney disease, or other metabolic issues.

Short name

Urine Flow Rate Test

Frequently asked questions

What does a normal result mean?
A normal result typically shows balanced kidney function and proper fluid excretion. However, your doctor will interpret results based on your overall health and symptoms.
How soon will I get my results?
Results are usually available within 1–3 business days, depending on lab processing times. Your doctor will contact you to discuss findings.
Can I drink fluids before the test?
Yes, but follow your doctor’s specific instructions. Drinking too much or too little may affect the accuracy of your urine flow rate measurement.
  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