Zeta Dx

About Urine Albumin to Creatinine Ratio (ACR)

The Urine Albumin to Creatinine Ratio (ACR) is a test used to detect small amounts of albumin (a type of protein) in the urine. It is an important marker for early kidney damage, especially in people with diabetes or hypertension.

Normal and Abnormal Values

Normal ACR values are usually less than 30 mg/g (or less than 3 mg/mmol). Values higher than this may indicate microalbuminuria or proteinuria, suggesting kidney damage.

Interpreting ACR Results

- Normal ACR: Less than 30 mg/g – indicates healthy kidneys.
- Microalbuminuria: 30–300 mg/g – early sign of kidney disease.
- Macroalbuminuria (Proteinuria): Greater than 300 mg/g – significant kidney damage requiring medical attention.

Example Calculation

If your urine albumin concentration is 50 mg/L and your urine creatinine concentration is 1000 mg/L, your ACR is 50/1000 = 0.05 mg/mg or 50 mg/g, indicating microalbuminuria.

Limitations and Notes

- ACR is a convenient spot urine test and correlates well with 24-hour urine albumin excretion.
- Results can be influenced by factors such as exercise, hydration, urinary tract infections, and fever.
- Multiple tests over time are recommended to confirm persistent albuminuria.
- Always discuss your results with a healthcare provider.

Disclaimer: This calculator is for educational purposes only and does not replace professional medical advice.