Understanding Albumin/Creatinine Ratio: Normal vs Optimal Ranges

Also known as: acr, urine albumin-to-creatinine ratio, uacr

Kidney FunctionUnit: mg/g

?What is Albumin/Creatinine Ratio?

The albumin/creatinine ratio (ACR) measures the amount of albumin protein in urine relative to creatinine levels, serving as an early marker of kidney dysfunction. This test is commonly used to detect microalbuminuria, which may indicate early-stage kidney disease or diabetes-related kidney damage. The ratio accounts for variations in urine concentration, making it more reliable than absolute albumin measurements.

!Why It Matters

An elevated ACR may suggest kidney damage or dysfunction, which can be associated with diabetes, hypertension, and progressive kidney disease. Detecting elevated levels early allows for timely intervention to slow or prevent further kidney deterioration. Regular monitoring of ACR can help identify at-risk individuals before significant kidney damage occurs.

Reference Ranges

Range TypeMinMaxUnitNote
Lab Normal30mg/gStandard lab reference range
Optimal30mg/gEvidence-based optimal range for health
Longevity Target30mg/gPer longevity medicine research (Attia et al.)

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

  • Swelling in feet, ankles, or face
  • Fatigue and weakness
  • Foamy or frothy urine
  • High blood pressure
  • Nausea or loss of appetite

How to Improve Your Levels

  • 1Maintain tight glycemic control if diabetic through diet and medication
  • 2Control blood pressure with lifestyle changes and medication as prescribed
  • 3Reduce sodium intake to less than 2,300 mg per day
  • 4Stay hydrated and limit caffeine consumption
  • 5Follow a kidney-friendly diet low in processed foods and excess protein
  • 6Exercise regularly and maintain a healthy weight

When to Test

Annual screening is recommended for individuals with diabetes or hypertension; those with a family history of kidney disease; or those with symptoms of kidney dysfunction. Baseline testing is important before starting certain medications, and repeat testing may be warranted if previous results were elevated.

Related Biomarkers

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