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

Why This Test Matters for Kidney Health

Kidneys normally filter waste and excess substances from your blood, including small amounts of protein like albumin. If your kidneys are damaged, they may allow more protein to leak into your urine. This test helps detect early signs of kidney problems by measuring the ratio of albumin to creatinine, which is a stable measure of urine volume.

How the Test Works

A small urine sample is collected, typically over a 24-hour period or a single random sample. The lab analyzes the sample to determine the concentration of albumin and creatinine. The ratio helps identify if protein is being lost in urine, which can indicate kidney issues.

When You Might Need This Test

Your doctor may recommend this test if you have symptoms like swelling, frequent urination, fatigue, or high blood pressure. It’s also used in screening for diabetes, hypertension, or kidney disease, especially in people with risk factors like family history or obesity.

What to Expect Before the Test

You’ll need to collect a urine sample, often over 24 hours (unless specified otherwise). Follow your doctor’s instructions carefully to ensure accurate results. Avoid certain foods or medications that might affect protein levels, if instructed.