Last updated October 8, 2026 · Report an error
Urine Protein-to-Creatinine Ratio (PCR) = urine protein (mg) / urine creatinine (g), a standard published spot-urine estimate of 24-hour proteinuria (in mg protein per g creatinine, which approximates mg of protein excreted per day). Commonly cited reference thresholds: normal is roughly under 150-200 mg/g, and nephrotic-range proteinuria is generally cited as over 3000-3500 mg/g. Pure arithmetic on given 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 protein in mg and urine creatinine in g. The tool divides protein by creatinine and compares the result to commonly cited reference thresholds.
- Enter urine protein (mg).
- Enter urine creatinine (g).
- Click Calculate to see your results.
Examples
Protein 150 mg, Creatinine 1.0 g
PCR = 150 / 1.0 = 150 mg/g — commonly cited as within the normal range.
Who should use it
- Reviewing a urine PCR lab result.
- Nephrology education about proteinuria assessment.
Industry applications
- Nephrology reference
- Chronic kidney disease monitoring education
Advantages
- Convenient spot-urine estimate of daily proteinuria.
- Standard, widely cited formula.
Limitations
- An approximation — actual 24-hour collection is the traditional reference standard.
- Affected by urine concentration and recent activity.
Common mistakes to avoid
- Mixing up urine protein (mg) with urine creatinine (g) unit conventions.
- Treating a single spot PCR as equivalent to a confirmed 24-hour collection without repeat testing.
Best practices
- Confirm a significantly abnormal PCR with a repeat test or, when needed, an actual 24-hour urine collection.
Tips
- PCR is typically tracked over time to monitor kidney disease progression or treatment response, not just as a single value.