Microalbuminuria Test (24-Hour Urine Collection)
This test measures very small amounts of a protein called albumin in your urine collected over a full 24-hour period to find early signs of kidney damage.
{"Microalbuminuria indicates early kidney damage, often before symptoms appear","It's especially important for patients with diabetes or high blood pressure","The test requires collecting all urine over a 24-hour period","Early detection allows for timely treatment to prevent kidney disease progression","Results are reported as milligrams of albumin per day"}
Key facts at a glance
- LOINC
- 53530-2
- Short code
- MA24
- Synonyms
- Microalbumin 24h Ur DL<=1mg/L-mCnc
- Category
- chemistry
- Sample
- urine
- Container
- 24-hour urine collection container (with or without preservative per laboratory protocol)
- Units
- not specified
- Ref low
- 0
- Ref high
- 30
- Critical range
- 1.5 not specified – —
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- detection-limit-mg-l
- CPT
- 82043
- SNOMED
- 271295002
- Specimen volume
- Complete 24-hour urine collection (total volume typically 1000-2000 mL depending on patient output)
- Stability
- Room temperature: 24-48 hours; Refrigerated (2-8°C): 5-7 days; Frozen (-20°C or below): 2-3 months
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 24–72 hours
- Order
- routine
What is this test?
The microalbuminuria test measures tiny amounts of a protein called albumin in your urine. Albumin is normally found in the blood and helps transport substances throughout your body. When your kidneys are healthy, they filter waste but keep important proteins like albumin in your blood. When kidneys are damaged, even slightly, small amounts of albumin leak into the urine—this is called microalbuminuria.
Why is it important?
Microalbuminuria is an early warning sign of kidney damage. Detecting it early is crucial because: 1) Kidney damage is often silent in its early stages with no obvious symptoms, 2) Early intervention can slow or prevent progression to more serious kidney disease, and 3) It also increases your risk of heart disease and stroke.
Who should have this test?
Your doctor may recommend this test if you have: Type 1 or Type 2 diabetes, high blood pressure (hypertension), a family history of kidney disease, or other conditions that affect the kidneys. For people with diabetes, annual microalbuminuria testing is strongly recommended as part of routine diabetes care.
How to collect a 24-hour urine sample
1) You will receive a special container from your healthcare provider. 2) Start by urinating in the toilet when you wake up on the first day. 3) For the next 24 hours, collect ALL urine in the container. 4) Keep the container refrigerated or in a cool place. 5) After 24 hours, urinate one last time and add this to the container. 6) Return the container to your lab as instructed. It's important to collect every urine sample during the 24-hour period for accurate results.
Understanding your results
Results are typically reported in milligrams per 24 hours (mg/24hr): Normal: Less than 30 mg/24hr. Microalbuminuria (early kidney damage): 30-300 mg/24hr. Macroalbuminuria (overt kidney disease): Greater than 300 mg/24hr. Your doctor will interpret your results based on your overall health and medical history.
Reference range
0-30 mg/Lnot specified
Complete 24-hour urine collection required; discard first morning void then collect all urine for 24 hours (including next morning void); refrigerate during collection; avoid vigorous exercise for 24 hours prior and during; no fasting required
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Microalbuminuria is a critical marker for: Early diabetic nephropathy (kidney disease caused by diabetes)—it can appear 5-10 years before significant kidney damage occurs. Cardiovascular risk—elevated albumin in urine is associated with increased risk of heart attack, stroke, and overall mortality. Hypertension-related kidney damage. Glomerular diseases and other kidney disorders. Treatment decisions—detecting microalbuminuria early allows doctors to optimize blood sugar control, adjust blood pressure medications (often using ACE inhibitors or ARBs), and implement lifestyle modifications to protect kidney function.
Frequently asked questions
Does having microalbuminuria mean I have kidney disease?
Can exercise affect the test results?
Will I feel any pain during the test?
What happens if my results are abnormal?
How often do I need this test?
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