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

Why This Test Matters for Kidney Health

Albumin is normally found in small amounts in urine, but if your kidneys are damaged, more albumin can leak into your urine. A 24-hour urine collection ensures you get an accurate picture of your protein loss, which can help doctors track kidney function over time.

How the Test Works

You’ll collect all your urine for a full 24-hour period, typically starting after you wake up. Your urine is then tested for albumin and creatinine levels. The ratio helps determine how much albumin is being lost relative to how much creatinine (a waste product from muscles) is present.

What to Expect Before the Test

No special preparation is needed, but you’ll need to keep track of all urine output in a container. Drink plenty of water to help flush your system, but avoid foods or medications that might affect urine protein levels (like certain supplements or high-sodium foods).

Common Causes of Abnormal Results

High albumin levels in urine may indicate kidney disease, diabetes, high blood pressure, or other conditions that damage kidney function. Low levels are usually normal, but repeated tests may be needed to confirm results.