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24-Hour Urinary Albumin-to-Creatinine Ratio (UACR)

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

This test measures the ratio of albumin (a protein) to creatinine in your urine over 24 hours. It helps assess how much protein your kidneys are losing in urine, which can indicate kidney damage or early kidney disease.

Quick summary

["A UACR test helps monitor kidney function and detect kidney problems early."]

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

Key facts at a glance

LOINC
74903-6
Short code
FA 24h Stl-mRate
Synonyms
FA 24h Stl-mRate
Category
chemistry
Sample
stool
Container
Clean container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 g
Stability
Refrigerated: 24h, Frozen: 7d
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test if you have symptoms like swelling in your legs, frequent urination, or high blood pressure. It’s also used for people with diabetes or high blood pressure to check for kidney issues, as these conditions can damage kidneys over time.

How Is the Test Performed?

You’ll collect all your urine for a full 24-hour period in a special container. The urine is then sent to a lab for testing. This method ensures you’re measuring protein loss consistently over time.

What Do the Results Mean?

The results show the ratio of albumin to creatinine in your urine. Higher ratios may suggest kidney problems, while normal results indicate healthy kidney function. Your doctor will interpret the results in relation to your overall health.

Common Causes of Abnormal Results

Elevated UACR levels can be caused by kidney disease, diabetes, high blood pressure, or other conditions that damage the kidneys. Low or normal levels usually mean your kidneys are working well.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is important because it helps doctors track kidney health in people at risk for kidney disease, such as those with diabetes or high blood pressure. It provides a clearer picture than a single urine protein test alone, as it accounts for daily urine volume and protein loss.

Short name

UACR (24-hour)

Frequently asked questions

Why do I need to collect urine for 24 hours?
Collecting urine over 24 hours gives a more accurate picture of your kidney function by measuring protein loss consistently throughout the day. This method reduces variability that can happen with a single urine sample.
What should I do if I miss part of the urine collection?
If you miss any urine, start the collection again immediately and discard any urine collected before the start time. Make sure to keep the container clean and refrigerate it if needed to prevent contamination.
Can I take medications or eat certain foods before this test?
Some medications or foods, like salt or certain supplements, may affect urine protein levels. Ask your doctor or lab technician about any restrictions to follow for the best results.
  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