Urine ACR — Albumin-to-Creatinine Kidney Marker
The urine albumin-to-creatinine ratio measures albumin passing into the urine. Above 30 mg/g is higher than normal and may be a sign of kidney disease.
The urine albumin-to-creatinine ratio (UACR) measures how much albumin, a blood protein, is passing into your urine — healthy kidneys let through very little, and a ratio above 30 mg/g is higher than normal and may be a sign of kidney disease.
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Healthy kidneys let through very little albumin, and one urine ratio measures how much is passing.
Transcript & sources → All videosMr. Age is AgeGen's editorial character. Facts come from the protocol above.
The biomarker
- Name: Urine Albumin-to-Creatinine Ratio (ACR)
- Units: mg/g
- Standard reference range: < 30 normal; 30–300 traditionally called microalbuminuria; > 300 traditionally called macroalbuminuria (ranges vary by lab)
How to read your result
| Value (mg/g) | Interpretation |
|---|---|
| < 30 | Normal |
| 30–300 | Higher than normal (traditionally microalbuminuria) — see a clinician |
| > 300 | Higher than normal (traditionally macroalbuminuria) — see a clinician |
What moves the needle
- Testing cadence. Every year if you have diabetes; ask about it if you have high blood pressure.
- Clinician. A result above 30 mg/g is a reason to talk to your clinician.
Why this test is worth asking for
- It is used to look for signs of kidney disease in people at high risk who do not have symptoms — above all people with diabetes, and people with high blood pressure.
- Comparing albumin with creatinine gives a more accurate measure of how much albumin is in the urine than albumin alone.
- It is taken from a urine sample, and it is one of the two key markers of kidney health, together with eGFR.
Related protocols
- Uric Acid — Metabolic + Gout Marker
- SHBG — Sex Hormone Binding Globulin
- HbA1c — Three-Month Glucose Average
Sources
- MedlinePlus — Microalbumin Creatinine Ratio
- NIDDK — Albuminuria: Albumin in the Urine
- NIDDK — Quick Reference on UACR & GFR
AgeGen lab guides are educational only. We do not provide medical diagnosis, prescribe brands, or recommend specific doses. Talk to a licensed clinician before changing your supplement or medication routine.
