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Calculators
Health Calculators
Urology & Nephrology
BUN/Creatinine Ratio

BUN/Creatinine Ratio

Differentiate causes of acute kidney injury.

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About BUN/Creatinine Ratio

The BUN/Creatinine Ratio tool calculates the ratio of Blood Urea Nitrogen (BUN) to serum creatinine. Designed for clinicians, including physicians, residents, and medical students, it aids in differentiating causes of acute kidney injury (AKI) and suspected renal dysfunction. By providing this simple, readily available ratio, the tool helps distinguish between pre-renal, intrinsic renal, and post-renal AKI. For instance, a high ratio (typically >20:1 with normal creatinine) often indicates pre-renal azotemia, suggesting conditions like dehydration. Conversely, a lower ratio may point to intrinsic kidney disease. This quick calculation offers immediate value, guiding initial diagnostic pathways and informing management strategies for patients with compromised kidney function.

Next Steps
GFR Calculator (CKD-EPI)
Estimate Glomerular Filtration Rate using the race-free 2021 equation.
Creatinine Clearance (CrCl)
Cockcroft-Gault formula for kidney function assessment.
ACR (Albumin/Creatinine Ratio)
Screening for diabetic nephropathy and chronic kidney disease.
PCR (Protein/Creatinine Ratio)
Assess proteinuria in renal disease.
FENa Calculator
Fractional Excretion of Sodium for AKI workup.
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Renal Function & Filtration
Renal Function & Filtration

Calculate Glomerular Filtration Rate (GFR) and Creatinine Clearance using clinical standard formulas.

Medical Disclaimer
This tool is for educational and screening purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.