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Urine Albumin-to-Creatinine Ratio (ACR) = urine albumin (mg) / urine creatinine (g or mmol, both unit conventions supported), the standard published spot-urine screening test for kidney damage (see KDIGO 2012 Clinical Practice Guideline for CKD evaluation). Commonly cited reference bands: normal is under 30 mg/g (under 3.4 mg/mmol), microalbuminuria is 30-300 mg/g (3.4-34 mg/mmol), and macroalbuminuria is over 300 mg/g (over 34 mg/mmol). Pure arithmetic on given lab values. For general reference and educational purposes only — not a medical diagnosis. Consult a doctor for actual kidney function assessment.
How it works
Enter urine albumin in mg and urine creatinine in your lab's reported unit (grams or millimoles). The tool divides albumin by creatinine and compares the result to standard KDIGO reference bands.
- Enter urine albumin (mg).
- Enter urine creatinine.
- Enter creatinine unit.
- Click Calculate to see your results.
Examples
Albumin 25 mg, Creatinine 1.2 g
ACR = 25 / 1.2 = 20.83 mg/g — within the commonly cited normal band (< 30 mg/g).
Who should use it
- Reviewing a urine ACR lab result.
- Diabetes and kidney health screening education.
Industry applications
- Nephrology and primary care reference
- Chronic kidney disease screening programs
Advantages
- Standard, guideline-referenced formula.
- Supports both common unit conventions.
Limitations
- A single spot measurement — guidelines often recommend confirming with a repeat test.
- Affected by non-kidney factors like recent exercise or infection.
Common mistakes to avoid
- Mixing up which unit (g vs mmol) the lab used for urine creatinine.
- Interpreting a single elevated ACR as diagnostic without a repeat confirmatory test, as guidelines commonly recommend.
Best practices
- Confirm an abnormal ACR with a repeat test, since transient factors (exercise, fever, UTI) can elevate it temporarily.
Tips
- ACR is typically interpreted alongside eGFR for a fuller picture of kidney health, per KDIGO guidelines.