🫘 Urine Protein/Creatinine Ratio for 24h Proteinuria
The urine protein-to-creatinine ratio estimates 24-hour proteinuria from a single random sample.
A first-morning specimen is preferred, as orthostatic and exercise-related proteinuria inflate random samples (original synthesis · not guideline verbatim).
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When to use
Enter urine protein and urine creatinine (both mg/dL); the tool returns the estimated daily proteinuria and a category band.
How it works
Estimated 24h proteinuria (g) ≈ urine protein (mg/dL) / urine creatinine (mg/dL). Bands: <0.15 normal, 0.15–0.5 mild, 0.5–3 moderate, ≥3.5 nephrotic.
Key points
- A first-morning specimen is preferred, as orthostatic and exercise-related proteinuria inflate random samples (original synthesis · not guideline verbatim).
- Results are distorted by abnormal muscle mass and extreme urine concentration, where creatinine excretion deviates from the ~1 g/day assumption.
- If urine creatinine is reported in mmol/L, convert (×11.3 to mg/dL) before applying the ratio.
References
- Ginsberg JM, et al. Use of single voided urine samples to estimate quantitative proteinuria. N Engl J Med. 1983.
- KDIGO 2012 Clinical Practice Guideline for the Evaluation and Management of CKD. Kidney Int Suppl. 2013.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Urine protein | 200 mg/dL |
|---|---|
| Urine creatinine | 100 mg/dL |
→Estimated 24h proteinuria2g/24h
- Interpretation：Moderate proteinuria
Frequently asked questions
- What is Urine Protein/Creatinine Ratio for 24h Proteinuria?
- The urine protein-to-creatinine ratio estimates 24-hour proteinuria from a single random sample.
- How is Urine Protein/Creatinine Ratio for 24h Proteinuria calculated? What is the core formula?
- Estimated 24h proteinuria (g) ≈ urine protein (mg/dL) / urine creatinine (mg/dL). Bands: <0.15 normal, 0.15–0.5 mild, 0.5–3 moderate, ≥3.5 nephrotic.
- When is Urine Protein/Creatinine Ratio for 24h Proteinuria used?
- Enter urine protein and urine creatinine (both mg/dL); the tool returns the estimated daily proteinuria and a category band.
- What are the key clinical points for Urine Protein/Creatinine Ratio for 24h Proteinuria?
- A first-morning specimen is preferred, as orthostatic and exercise-related proteinuria inflate random samples (original synthesis · not guideline verbatim). Results are distorted by abnormal muscle mass and extreme urine concentration, where creatinine excretion deviates from the ~1 g/day assumption. If urine creatinine is reported in mmol/L, convert (×11.3 to mg/dL) before applying the ratio.
- What are the limits and cautions when using Urine Protein/Creatinine Ratio for 24h Proteinuria?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- How is Urine Protein/Creatinine Ratio for 24h Proteinuria calculated in practice? Can you show a worked example?
- Inputs: Urine protein 200 mg/dL, Urine creatinine 100 mg/dL → Result: Estimated 24h proteinuria 2 g/24h（Interpretation: Moderate proteinuria）