Urine Protein-to-Creatinine Ratio (24-hour collection)
This test measures the amount of protein and creatinine in your urine over a full day. It helps assess how much protein your kidneys are losing, which can indicate kidney damage or other kidney-related conditions.
["Helps detect early kidney problems by checking protein loss over time."]
Key facts at a glance
- LOINC
- 75665-0
- Short code
- O+P Ur Tri Stn
- Synonyms
- O+P Ur Tri Stn
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- trichrome-stain
- 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 Matters in Kidney Health
Kidneys normally filter waste and excess substances from your blood, including small amounts of protein. When kidneys are damaged, they may allow more protein to leak into urine. This test helps track protein loss over a 24-hour period, which can reveal kidney function issues before symptoms appear.
What to Expect Before the Test
You’ll collect all your urine for a full 24-hour period in a special container. Drink plenty of fluids to ensure adequate urine production. Store the urine in a cool place and return it to your lab or doctor’s office on the same day. Avoid certain medications that might affect results.
How the Test Works
The urine sample is tested for protein and creatinine levels. Creatinine is a waste product from muscle metabolism that helps normalize protein measurements. The ratio compares protein to creatinine to identify abnormal protein loss.
Possible Causes of Abnormal Results
High ratios may signal kidney disease, diabetes, or conditions like glomerulonephritis. Low ratios are less common but could indicate dehydration or other metabolic issues. Your doctor will discuss results in the context of your medical history and symptoms.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated protein levels in urine can indicate kidney damage or disease, even if blood tests show normal kidney function. This test is particularly useful for monitoring chronic kidney disease, diabetes-related kidney damage, or other conditions affecting kidney filtration. Early detection allows for timely interventions to slow progression.
Short name
24-Hour Urine Protein-to-Creatinine Ratio
Frequently asked questions
What does a high urine protein-to-creatinine ratio mean?
Does diet affect this test?
Can I take medications 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