UACR, explained
UACR measures how much albumin (a blood protein) is leaking into your urine, corrected for urine concentration — it is the earliest routine sign of kidney damage.
What’s a normal UACR level?
Typical adult reference range, shown for orientation. Your report’s range may differ by lab, age, and sex — the analyzer uses your report’s own ranges when available.
What high and low UACR mean
A value outside the reference range is a flag, not a diagnosis. Here’s what each direction usually points to — and the most common causes.
A high UACR means albumin is leaking through the kidney filter — early kidney damage, most commonly from diabetes or hypertension, and an independent marker of cardiovascular risk.
- Diabetic kidney disease (the most common cause worldwide)
- High blood pressure damaging the kidney filters
- Glomerular diseases, lupus, or other kidney inflammation
- Temporary rises from fever, vigorous exercise, urinary infection, dehydration, or menstruation
A low UACR is the desirable result — under 30 mg/g means the kidney filter is holding on to protein as it should.
- Normal kidney filtration (the expected, healthy state)
When a UACR result needs attention
Two of three samples over 30 mg/g within three months confirm persistent albuminuria and should be reviewed with your clinician, especially with diabetes or high blood pressure. A UACR above 300 mg/g, or a rapidly rising value, needs prompt kidney evaluation.
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UACR (Urine Albumin-to-Creatinine Ratio) — frequently asked questions
- What is a normal UACR?
- Under 30 mg/g (about 3 mg/mmol) is normal. 30–300 mg/g is moderately raised and over 300 mg/g is severely raised. Because exercise, fever, infection and dehydration can push a single result up, a raised value is confirmed on a repeat first-morning sample before it is called persistent.
- Why does my doctor check UACR if my creatinine is normal?
- Because albumin leaks before filtration falls. Creatinine and eGFR only rise once a large share of kidney function is lost; UACR picks up damage years earlier, when treatment with blood-pressure or diabetes medication can still slow it down. Guidelines recommend it at least yearly for anyone with diabetes or hypertension.
- Can a high UACR go back to normal?
- Often, yes. Tight blood-sugar and blood-pressure control, ACE-inhibitor or ARB medication, SGLT2 inhibitors, stopping smoking and reducing salt can all lower albumin leakage and sometimes return it to the normal range. Temporary rises from illness or exercise resolve on their own.
Related lab markers
- Cystatin C →Cystatin C is a small protein made by every cell at a steady rate and cleared only by the kidneys — a measure of kidney filtration that, unlike creatinine, is not skewed by muscle mass.
- Creatinine →Creatinine is a muscle waste product cleared by the kidneys — the standard blood marker used to estimate kidney function.
- Hemoglobin A1c →HbA1c reflects your average blood sugar over roughly the past three months — the standard test for diagnosing and monitoring diabetes.
- All lab markers →Browse every biomarker guide in one place.
This page provides educational health information and does not replace professional medical advice, diagnosis, or treatment. Interpret any lab value with your clinician, who has your full medical context. For emergencies, contact emergency services.