MICROALBUMIN CREATININE RATIO; ACR

What this test checks

Measures the ratio of albumin to creatinine in a urine sample. Small increases are an early sign that diabetes or high blood pressure is damaging the kidneys.

Why do people get this test?

The most sensitive early-warning test for diabetic kidney disease — far earlier than blood tests turn abnormal.

When you should consider this test

• Diabetes — annual screening
• High blood pressure — yearly check
• Family history of kidney disease

How to prepare

First morning urine sample is best, but any time works.