Urine microalbumin (albumin-to-creatinine ratio, ACR) detects small amounts of albumin protein leaking into the urine, an early sign of kidney damage.
- Normal range (adults)
- Below 30 mg/g (below 3.4 mg/mmol)
- Sample
- Urine
- Fasting
- Not usually needed
- Also called
- Urine Microalbumin, Urinary Albumin, Microalbumin Urine, ACR, Albumin Creatinine Ratio
Urine Microalbumin normal range
| Group | mg/gConventional units: US, South Asia | mg/mmolSI units: UK, Europe, Australia, international |
|---|---|---|
| Adults | Below 30 | Below 3.4 |
Your report may use either unit system; labs in the Gulf often print both. Ranges also vary slightly between laboratories, so the range printed on your own report is the one to go by.
Why is the Urine Microalbumin test done?
It is a yearly screening test for people with diabetes or high blood pressure, often picking up kidney damage years before creatinine or eGFR change.
What does a high Urine Microalbumin level mean?
A raised ACR means the kidneys' filters are leaking. It is also a marker of higher heart risk. Exercise, fever or a urine infection can cause a temporary rise.
Common causes
- Diabetes
- High blood pressure
- Chronic kidney disease
- Heavy exercise, fever or urine infection (temporary)
Diet and lifestyle tips
- Keep blood sugar on target
- Keep blood pressure on target; limit salt
- Stop smoking
- Avoid painkillers such as ibuprofen
- Avoid very high-protein diets
When should you see a doctor?
A raised ACR should be confirmed on 2 of 3 samples over 3 to 6 months. Your doctor may start kidney-protecting medicines.
Last updated
This page is for general education and is not a diagnosis. Normal ranges differ between laboratories, so always compare your result with the reference range printed on your own report, and discuss abnormal results with your doctor.