Microalbumin Urine Panel

What this test measures

Albumin is a protein made by the liver and normally held in the bloodstream by the filtering units of the kidneys. When those filters become damaged or stressed, small amounts of albumin can leak into urine before larger proteins do. A microalbumin measurement detects these low levels, which fall below the range of a standard urine protein dipstick. Catching leakage early gives clinicians a chance to monitor kidney function more closely.

This test uses a random urine sample rather than a full 24-hour collection. Because urine concentration varies through the day, the result is often paired with a urine creatinine measurement and reported as an albumin-to-creatinine ratio. The ratio adjusts for how dilute or concentrated the sample happens to be and is generally more consistent than a bare albumin value when a random sample is used.

The test is typically ordered for people being monitored for chronic conditions that affect the kidneys, or who have a family history of kidney problems. It may also form part of a broader kidney function assessment. Results are read alongside blood tests such as creatinine and estimated glomerular filtration rate, and a single elevated value is often confirmed with a repeat sample.

• Urine microalbumin concentration
• Urine albumin
• Urine creatinine
• Albumin-to-creatinine ratio (ACR)
• Microalbumin-to-creatinine ratio
• Urine total protein when included
• Estimated albumin excretion rate when calculated

Why people order this test

• Monitor kidney health in people with diabetes
• Assess how high blood pressure may be affecting the kidneys
• Investigate a family history of kidney disease
• Provide an early marker when standard urine protein testing is normal
• Follow trends in people whose clinician is tracking kidney function
• Evaluate protein found incidentally on a urine dipstick

How to prepare

No fasting is usually required for a random urine microalbumin test. A clinician may ask for a first-morning sample, or for the sample to be collected after avoiding strenuous exercise, which can temporarily raise protein levels in urine. Follow the collecting lab's instructions about timing and hydration.

Understanding your results

Results are generally available within one to three business days. An elevated albumin-to-creatinine ratio suggests that albumin is leaking into urine and may point to early kidney involvement, but it is not a diagnosis on its own. Values are usually interpreted with other kidney tests and the person's overall health history.