Urine Protein-Creatinine Ratio (UPCR) — Free Online Calculator
Input
UPCR
—
Estimated 24hr Protein
—
About This Calculator
The Urine Protein-to-Creatinine Ratio (UPCR) estimates 24-hour urine protein excretion from a spot urine sample. It avoids the inconvenience of 24-hour urine collection. A UPCR > 3.5 mg/mg indicates nephrotic range proteinuria. The UPCR correlates well with 24-hour protein excretion and is recommended by KDIGO for monitoring proteinuria in CKD patients.
Formula
Interpretation
| UPCR (mg/mg) | ~24hr Protein | Interpretation |
|---|---|---|
| < 0.15 | < 150 mg/day | Normal |
| 0.15 – 0.5 | 150–500 mg/day | Mild proteinuria |
| 0.5 – 3.5 | 500–3500 mg/day | Moderate proteinuria |
| > 3.5 | > 3500 mg/day | Nephrotic range |
References
Frequently Asked Questions
When should UPCR be used instead of 24-hour urine collection?
UPCR is preferred for screening and monitoring due to convenience. It can be done from any spot urine, preferably a first morning void. 24-hour collection may still be needed for precise quantification, evaluating creatinine clearance, or when spot UPCR results are discordant with clinical findings.
Does the timing of urine collection affect UPCR?
Yes. First morning void provides the most accurate correlation with 24-hour protein. Random samples may overestimate proteinuria due to exercise, upright posture, or concentrated urine. First morning void eliminates orthostatic proteinuria.
What is the difference between UPCR and UACR?
UPCR measures total protein while UACR (Urine Albumin-to-Creatinine Ratio) specifically measures albumin. UACR is preferred for diabetic nephropathy screening (KDIGO guidelines recommend UACR). UPCR detects all types of proteinuria including tubular and overflow proteinuria.
Related Calculators
⚠ Medical Disclaimer
This tool is for educational and informational purposes only. It is not intended to replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare professional for clinical decisions.