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Cystatin C Urine Protein-to-Creatinine Ratio (Quantitative)

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

This test measures the ratio of protein in your urine to a substance called creatinine, which helps assess kidney function and detect early signs of kidney damage.

Quick summary

["Helps identify kidney issues by checking urine protein levels relative to kidney function marker creatinine."]

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

Key facts at a glance

LOINC
35884-6
Short code
CT Guided Abd Absc drain+cath place
Synonyms
CT Guided Abd Absc 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 to monitor kidney health, especially if you have diabetes, high blood pressure, or a family history of kidney problems. It can also help track kidney function over time or after treatment for conditions like kidney disease or certain medications.

What to Expect Before the Test

No special preparation is needed. You’ll provide a urine sample in a clean container. Avoid strenuous activity or heavy meals 24 hours before testing to ensure accurate results.

How the Test Works

Your urine sample is analyzed to measure protein levels and creatinine. The ratio helps determine if your kidneys are filtering waste properly, which may indicate kidney damage or disease.

What the Results Mean

Higher-than-normal ratios may signal kidney problems, such as nephropathy (kidney disease) or other conditions affecting urine protein excretion. Your doctor will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is clinically significant because it provides a non-invasive way to evaluate kidney function and detect early kidney damage, which can be critical for managing chronic conditions like diabetes or hypertension.

Short name

Urine Protein:Creatinine Ratio

Frequently asked questions

How long does it take to get my urine protein-to-creatinine ratio results?
Results are typically available within 1–3 business days, depending on your lab’s processing schedule. Follow-up with your healthcare provider to discuss findings.
Can I drink water before this test?
Yes, you can drink water normally, but avoid excessive fluid intake 24 hours before testing to ensure accurate protein measurement.
Does this test replace a kidney function blood test (like creatinine clearance)?
No, this test focuses on urine protein, while blood tests (e.g., creatinine clearance) assess kidney function differently. Together, they provide a more complete picture of kidney health.
  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