Microalbumin (Urine)
Measures small amounts of albumin protein in urine to detect early kidney damage, especially important for individuals with diabetes or high blood pressure.
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What this test measures
This test detects small amounts of albumin protein in the urine, a finding called microalbuminuria. Healthy kidneys filter waste from the blood while retaining essential proteins like albumin; when the kidney's filtration system is damaged, albumin begins leaking through in quantities too small to detect on a standard urinalysis but large enough to signal early trouble. The test often calculates an albumin-to-creatinine ratio (ACR) from the same sample, which adjusts for urine concentration and provides a more consistent measurement than albumin alone.
Microalbuminuria is one of the earliest detectable signs of kidney damage, particularly in individuals with diabetes or hypertension, the two leading causes of chronic kidney disease. In people with type 2 diabetes, microalbuminuria is often the first clinical indicator of developing nephropathy and is also associated with increased cardiovascular risk and hypertension-related vascular damage. Even in individuals without diabetes, the presence of microalbuminuria is linked to elevated cardiovascular risk. Detecting it early creates an opportunity for interventions (blood sugar control, blood pressure management, medication adjustments) that can slow or prevent progression to more severe kidney disease.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals with diabetes should consider this test annually, as up to 30% of people with newly diagnosed type 2 diabetes will already have abnormally high urine albumin levels, and annual screening for microalbuminuria is indicated for all individuals with diabetes mellitus.
- Those with high blood pressure may benefit from microalbumin testing, since in diabetic and hypertensive patients, microalbuminuria is a predictor of future development of clinical renal disease and can help identify cardiovascular risk factors early.
- People with a family history of kidney disease or diabetes should consider screening, particularly those with additional risk factors such as poor glycemic control, longer duration, hypertension, retinopathy, high-normal albuminuria, nonwhite race, family history of hypertension.
- Individuals with cardiovascular disease may find this test valuable, as microalbuminuria is a predictor of cardiovascular morbidity and mortality in both hypertensive and normotensive patients, making it an important marker for overall vascular health.
- Those seeking comprehensive health monitoring should consider this test since the relationship between albuminuria and cardiorenal risk is continuous and linear, with evidence suggesting that risk begins to increase even at albumin excretion levels traditionally considered within the normal range.
What to expect
Preparation
No special preparation is needed for this test. Individuals can eat and drink normally beforehand. However, strenuous exercise should be avoided within 24 hours of testing, as it may temporarily elevate albumin levels.
Sample Type
The test requires a simple urine sample, typically collected as a random or spot sample. No preservatives are needed, and only a small amount of urine (about 1-3 mL) is required for testing.
Collection
At the lab location, individuals will be provided with a sterile container and directions for clean-catch urine collection. The sample should be collected midstream to ensure accuracy and prevent contamination.
Turnaround
Results are typically available within 1-2 business days. The lab will measure both albumin and creatinine levels to calculate the albumin-to-creatinine ratio for the most accurate assessment.
Understanding your results
Results are typically reported as an albumin-to-creatinine ratio (ACR) in milligrams per gram (mg/g). Values below 30 mg/g are considered normal. Levels between 30 and 300 mg/g indicate microalbuminuria, suggesting early kidney damage that may be reversible with appropriate treatment. Values above 300 mg/g represent macroalbuminuria, indicating more advanced kidney involvement. Healthcare providers interpret results alongside blood pressure, blood sugar control (HbA1c), kidney function markers (eGFR, creatinine), and clinical history to determine the cause and guide treatment decisions aimed at protecting kidney function.
| Population | Reference Range | Notes |
|---|---|---|
| Adults | < 30 mg/g creatinine | Normal albumin-to-creatinine ratio indicating healthy kidney function |
| Adults | 30-299 mg/g creatinine | Microalbuminuria range suggesting early kidney damage |
| Adults | ≥ 300 mg/g creatinine | Clinical albuminuria indicating significant kidney damage |
Reference ranges may vary by laboratory and individual factors. Results should be interpreted by a healthcare provider in the context of your overall health.
What does a “Low” result mean?
Low or undetectable levels of microalbumin typically indicate normal kidney function and healthy filtration. Normal levels are less than 30 mg of albumin per gram of creatinine in the urine, suggesting that the kidneys are effectively preventing protein loss while allowing waste products to be eliminated properly. Very low levels are generally not a cause for concern and represent optimal kidney health.
What does a “High” result mean?
Microalbuminuria (between 30 and 300 mg of albumin per gram of creatinine) indicates early kidney damage, while macroalbuminuria (greater than 300 mg/g) indicates more significant kidney damage. Elevated levels may be associated with diabetes-related kidney disease, high blood pressure, or cardiovascular complications. Urinary tract infections, hematuria, and disturbances in acid-base balance may lead to falsely elevated results, so repeat testing is often recommended to confirm abnormal findings. Other factors that can temporarily increase albumin levels include fever, exercise, and poor blood sugar control.
Privacy & confidentiality
All microalbumin test results are kept strictly confidential and are protected by HIPAA regulations. Results are not shared with insurance companies or added to your permanent medical record without your consent. No doctor visit is required to order this test, ensuring your privacy throughout the testing process.
Frequently asked questions
Related tests
Glomerular Filtration Rate (GFR)
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Essential for diabetic patients to monitor overall disease management alongside kidney health
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Provides additional urine analysis to complement microalbumin testing for kidney health
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Last reviewed: April 2026
CPT Code: 82043, 82570
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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LevelPanel has no business or affiliate relationship with Quest or LabCorp. These links are provided as a public service.
Lab testing services linked from this site are not available to residents of Alaska, Arizona, or Hawaii, unless otherwise noted on the lab's own website.
This publication is not intended to solicit the purchase of laboratory testing from any individual consumer.
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