Albumin to Creatinine Ratio (ACR) or Urine Albumin-to-Creatinine Ratio (UACR)

Why This Test Matters for Kidney Health

Kidneys normally filter waste and excess substances from your blood, including small amounts of albumin. If your kidneys are damaged, they may allow more albumin into your urine. This test helps identify kidney issues early, even before symptoms appear, by measuring albumin relative to creatinine—a stable measure of kidney function.

How the Test Works

A small urine sample is collected, typically first-morning urine. The albumin and creatinine levels are measured using a specialized urine test that compares their ratios. This avoids the need for 24-hour urine collection, making it easier and more convenient for patients.

When You Might Need This Test

Your doctor may order this test if you have risk factors for kidney disease, such as high blood pressure, diabetes, a family history of kidney problems, or symptoms like swelling, frequent urination, or fatigue. It’s also used to monitor kidney function in people with chronic conditions like diabetes or hypertension.

What to Expect During the Test

The test is quick and painless. You’ll collect a urine sample in a clean container, similar to a routine urine dipstick test. No special preparation is needed, but drinking plenty of water beforehand can help ensure an accurate result.