BUN/Creatinine Ratio Calculator
BUN/Creatinine Ratio
Formula
BUN/Creatinine Ratio = BUN (mg/dL) / Creatinine (mg/dL) | Normal: 10:1 to 20:1
Frequently Asked Questions
What is a normal BUN/Creatinine ratio?
Normal is 10:1 to 20:1. Adult normal BUN is 7-20 mg/dL and creatinine is 0.6-1.2 mg/dL.
What does a high BUN/Creatinine ratio mean?
A ratio above 20:1 often indicates pre-renal azotemia from dehydration, heart failure, or GI bleeding.
What does a low ratio mean?
A ratio below 10:1 may indicate intrinsic kidney damage, liver disease, or malnutrition.
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