Understanding Your Medical Test: Purpose, Procedure, and Results
A test that measures tiny amounts of protein (albumin) in urine to detect early kidney damage.
{"Detects early kidney damage, especially from diabetes","Collects urine over 8 hours for accurate measurement","Results below 20 μg/min are considered normal","Elevated levels may indicate early diabetic kidney disease","Early detection helps prevent kidney failure"}
Key facts at a glance
- LOINC
- 56553-1
- Short code
- Microalb/8hr
- Synonyms
- Microalbumin 8h Ur-mRate
- Category
- chemistry
- Sample
- urine
- Container
- Clean, sterile urine collection container or 24-hour urine container with preservative as required
- Units
- not specified
- Ref low
- 0
- Ref high
- 20
- Critical range
- 1.5 not specified – 300 not specified
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- ≥ 18 years
- Method
- detection-limit-mg-l
- CPT
- 82043
- SNOMED
- 39873004
- Specimen volume
- Minimum 5 mL, preferably 10-20 mL urine
- Stability
- Room temperature: 24-48 hours; Refrigerated (2-8°C): 5-7 days; Frozen (-20°C): 30 days
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 24–72 hours
- Order
- routine
What is this test? This test is used to evaluate a specific health concern by measuring or examining information from your body, helping your healthcare professional guide diagnosis and care.
The 8-hour urine microalbumin test measures very small amounts of a protein called albumin in your urine. Unlike standard urine protein tests, this test can detect minute quantities of albumin—even as low as a few milligrams—that would be missed by routine tests. This makes it crucial for catching kidney damage at its earliest, most treatable stage.
Why is it important? The test can provide valuable information about your health, help identify possible problems early, monitor an existing condition, or determine whether treatment is working as expected.
Your kidneys act as filters, normally keeping albumin in your blood. When kidney blood vessels are damaged—even slightly—albumin leaks into urine. This often happens years before symptoms appear. The microalbumin test identifies this leakage early, giving you a critical window to protect your kidneys through treatment and lifestyle changes.
How is the test done? Depending on the test, a healthcare professional may collect blood, urine, tissue, or another sample, or perform an imaging or monitoring procedure; you will receive instructions beforehand.
You will collect all urine produced during an 8-hour period (usually overnight) into a special container provided by your healthcare provider. It's important to: collect the first morning urine separately, save all urine during the 8-hour period, keep the container refrigerated or cool during collection, and return the sample to the lab as instructed. Avoid strenuous exercise and infections around the test time, as these can temporarily increase albumin levels.
Understanding your results: Your results should be interpreted together with your symptoms, medical history, and other findings. Your healthcare professional will explain what they mean and whether follow-up is needed.
Results are typically reported in micrograms per minute (μg/min) or milligrams per 24 hours. Normal: less than 20 μg/min (or less than 30 mg/24 hours). Moderately elevated: 20-200 μg/min indicates early kidney damage (microalbuminuria). Severely elevated: above 200 μg/min suggests significant kidney disease (macroalbuminuria). Your doctor will interpret your results based on your overall health and may repeat the test to confirm findings.
Reference range
0-20 mg/8 hnot specified
No fasting required. Collect complete timed 8-hour urine specimen (preferably overnight); avoid vigorous exercise, UTI, or fever prior to/during collection; refrigerate specimen.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
The primary purpose of this test is early detection of diabetic nephropathy—kidney damage caused by diabetes. It is recommended annually for anyone with type 1 diabetes (after 5 years) or type 2 diabetes (at diagnosis). The test is also valuable for detecting kidney damage from hypertension, glomerulonephritis, and other conditions. Finding microalbuminuria early allows interventions like blood pressure control (especially with ACE inhibitors or ARBs), better diabetes management, and lifestyle modifications that can slow or prevent progression to kidney failure.
Frequently asked questions
Do I need to fast before this test?
What happens if my results are elevated?
How often should I have this test?
Can a single abnormal result confirm kidney disease?
Sources
- 1
- 2
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 17, 2026. · Read our editorial policy