Skip to content

Urine Protein-to-Creatinine Ratio (qualitative or semiquantitative screening)

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

This test measures the ratio of protein in your urine to a small protein called creatinine, which comes from muscle breakdown. It helps detect early kidney damage or protein loss in urine.

Quick summary

["Assesses kidney function and potential proteinuria (excess protein in urine) without requiring a full urine collection."]

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

Key facts at a glance

LOINC
101668-2
Short code
RMPQU Ur
Synonyms
RMPQU Ur
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
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 Matters

Your kidneys normally filter waste and excess substances from your blood. If they’re damaged, they may allow too much protein to pass into your urine. This test helps identify early signs of kidney problems, including conditions like diabetic nephropathy or glomerulonephritis.

When You Might Need It

Your doctor may order this test if you have symptoms like swelling, frequent urination, or high blood pressure. It’s also used in routine check-ups for people with diabetes, high blood pressure, or a family history of kidney disease.

How the Test Works

A small urine sample is collected (often at home) and tested for protein and creatinine levels. The ratio helps determine if protein loss is present, even if the protein levels alone aren’t elevated.

What to Expect

You’ll likely collect a midstream urine sample (like a clean-catch) or provide a timed 24-hour urine sample. The test is quick and painless, but timing matters—some tests require specific urine volumes or timing (e.g., first-morning urine).

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Urine Protein-Creatinine Ratio (UPCR) Screening

Frequently asked questions

A high ratio may indicate kidney damage or disease, while a normal ratio suggests healthy filtration. Repeated tests can track progression of kidney issues or monitor treatment effectiveness in chronic conditions.
This test is not a definitive diagnosis but a screening tool. If results are abnormal, your doctor may recommend further testing, like a 24-hour urine protein collection or kidney function tests.
How often should I get this test?
Your doctor will determine the frequency based on your health status. For example, people with diabetes or kidney disease may need it more often than others.
What does a ‘positive’ result mean?
A ‘positive’ result typically means the ratio is higher than expected, suggesting possible kidney problems. Your doctor will discuss next steps, such as additional tests or lifestyle changes.
  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