Urine Albumin-to-Creatinine Ratio (UACR)
The urine albumin-to-creatinine ratio (UACR) measures a small amount of the protein albumin leaking into the urine, normalized to urine creatinine so a single spot sample reflects 24-hour excretion. It is one of the earliest, most sensitive signals of kidney and blood-vessel injury. A longevity practice tracks UACR because rising albuminuria flags endothelial and glomerular damage years before kidney filtration (eGFR) declines, and it independently predicts cardiovascular and all-cause mortality.
What It Measures
Early kidney and vascular injury via albumin leakage into urine; a sensitive marker of endothelial and glomerular health.
Optimal vs. Lab Range
Target range for optimal health and longevity based on research.
Population-based reference range from standard labs.
Why It Matters
Albuminuria reflects systemic endothelial dysfunction, not just kidney disease, which is why it predicts cardiovascular events and mortality even in people with normal kidney filtration. A 2024 systematic review and meta-analysis found that albumin excretion within the conventionally "normal" range (UACR 10–30 mg/g) was already associated with higher all-cause mortality (pooled hazard ratio ~1.41) and coronary heart disease (~1.56) compared with UACR below 10 mg/g. KDIGO stages albuminuria as A1 (<30), A2 (30–300), and A3 (>300 mg/g) and recommends interpreting UACR alongside eGFR because each adds independent prognostic information. Because albuminuria is often reversible with blood-pressure, glucose, and metabolic optimization, it is a high-value, actionable longevity marker. Values can be transiently raised by recent intense exercise, fever, urinary infection, or menstruation, so a persistently elevated result should be confirmed on repeat testing.
When Low
Very low UACR (<10 mg/g) indicates healthy glomerular and endothelial function and the lowest associated cardiovascular and mortality risk.
When Optimal
A UACR under ~10 mg/g reflects optimal vascular and kidney health; keeping it low is protective.
When High
Rising UACR signals early kidney/vascular injury: A2 (30–300 mg/g) is moderately increased and A3 (>300) severely increased. Elevation is associated with diabetes, hypertension, atherosclerosis, and higher cardiovascular and all-cause mortality. Transient causes include recent exercise, fever, infection, or menstruation, so confirm on a repeat sample.
How to Optimize
Lowering albuminuria centers on tight control of the drivers of vascular and glomerular stress: blood pressure, blood glucose, and body weight. Physician-directed therapies such as ACE inhibitors or ARBs and SGLT2 inhibitors are well established to reduce albuminuria and protect the kidney when clinically indicated. A whole-food, lower-sodium dietary pattern, regular aerobic exercise, smoking cessation, and optimizing metabolic markers (HbA1c, insulin, ApoB) all help. Because UACR can fluctuate, confirm an elevated value on a repeat first-morning sample and retest periodically to track the trend. Diagnosis and treatment are individualized with your physician; this content is educational and not a substitute for medical advice.
Key Interventions & Linked Compounds
Strong evidenceKey Interventions
Curated from clinical literature. Individual results vary; consult a qualified clinician before changing a protocol.
Ordering Notes
Specimen
Spot urine (first-morning preferred)
Patient prep
No fasting required. Maintain usual diet and medications unless advised.
Recommended cadence
Annual (more often with diabetes, hypertension, or CKD)
Reporting unit
mg/g
Pre-analytic notes
Standardize draw time of day, hydration, and recent exercise. Note any acute illness, supplements, or hormonal therapies on the requisition.
Recommended Follow-Up Actions
- 1
Confirm the result is reliable
Repeat abnormal values before acting — preferably from the same lab, same time of day, and under consistent prep. Rule out acute illness, recent intense exercise, or medication effects that can shift Urine Albumin-to-Creatinine Ratio (UACR).
- 2
Compare against optimal, not just lab range
Use the optimal window above as the target. Lab "normal" is built from the general population and often misses early dysfunction.
- 3
Pair with related markers
Order a complementary panel covering metabolic, inflammatory, and hormonal context to interpret this marker properly.
- 4
Discuss interventions with a clinician
Use the interpretation guidance above to frame the conversation. Bring trends, not just one datapoint, to your visit.
- 5
Re-test on a defined cadence
If a change is implemented, re-measure in 8–12 weeks for fast-moving markers, or 3–6 months for slower ones, to confirm response before escalating.
Testing Information
Recommended Frequency
Annual (more often with diabetes, hypertension, or CKD)
Fasting Requirement
No fasting required
Available Test Types
Quick Actions
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