Urine for Microalbumin is a laboratory urine test that checks for very small (“micro”) amounts of albumin (a blood protein) in your urine. Healthy kidneys keep albumin in the bloodstream. When the kidneys’ tiny filtering units (glomeruli) become irritated or damaged, small amounts of albumin can leak into the urine—often before routine urine protein tests turn positive. This makes the microalbumin urine test an important tool for spotting early kidney damage and monitoring kidney health.

Results are commonly reported as either:

• Urine albumin-to-creatinine ratio (uACR) from a single “spot” urine sample (most common), which adjusts for urine concentration, or
• Albumin level in a timed or 24-hour urine collection.

In plain language, the results suggest:

• Normal/low albumin: kidneys are filtering well and not leaking significant protein.
• Moderately increased albumin (microalbuminuria): an early warning sign that the kidneys may be under stress (often from diabetes or hypertension).
• High albumin (more significant protein in urine): may indicate more advanced kidney injury and higher risk of chronic kidney disease.

Because urinary albumin can rise temporarily, a single abnormal result does not always mean permanent kidney disease. Your clinician may repeat the test and interpret it alongside other measures of kidney function (such as serum creatinine/eGFR) and your overall health.

This test is most often ordered to screen for and monitor early kidney damage in people at higher risk for renal disease. It is commonly part of routine care for:

• Diabetes (type 1 or type 2): high blood sugar can damage kidney filters over time, and microalbumin is often one of the earliest detectable signs.
• Hypertension (high blood pressure): ongoing pressure can harm kidney blood vessels and lead to protein in urine.

Your doctor may also order a microalbumin urine test if you have or are at risk for:

• Chronic kidney disease risk factors (family history of kidney disease, older age, obesity, smoking).
• Cardiovascular risk: urinary albumin can be a marker of blood vessel damage and is associated with higher heart and stroke risk.
• Abnormal kidney-related findings on other tests (e.g., previously noted protein in urine, declining eGFR, or unexplained swelling).

It may be recommended even when you feel well, because early kidney damage often has no symptoms. When symptoms do occur (often later), they can include swelling in the legs/ankles, foamy urine, fatigue, or changes in urination—symptoms that require medical evaluation but are not specific to microalbumin alone.

To help avoid misleading results, your clinician may advise postponing testing if you have temporary factors that can raise urinary albumin, such as a fever, urinary tract infection, recent vigorous exercise, dehydration, or recent acute illness.

• Diabetic kidney disease (diabetic nephropathy)
• Hypertensive nephrosclerosis (kidney damage from long-standing high blood pressure)
• Chronic kidney disease (CKD)
• Glomerulonephritis (inflammation of the kidney’s filtering units)
• Renal disease related to cardiovascular disease and metabolic syndrome
• Preeclampsia (pregnancy-related high blood pressure with kidney involvement)
• Early kidney damage from obesity or insulin resistance

• Protecting kidney health through early detection of kidney stress and timely treatment
• Diabetes management by monitoring for early complications and guiding therapy adjustments
• Blood pressure control by identifying kidney involvement and tracking response to treatment
• Reducing cardiovascular risk (heart attack and stroke risk) by recognizing albuminuria as a vascular risk marker
• Routine preventive screening for people with diabetes, hypertension, or other CKD risk factors
• Monitoring treatment effectiveness (e.g., lifestyle changes and prescribed medicines aimed at lowering urinary albumin)