Health

BUN/Creatinine Ratio Calculator

Differentiate causes of renal dysfunction using the BUN:Cr ratio.

BUN (mg/dL)

Creatinine (mg/dL)

BUN/Cr Ratio—

Interpretation—

Normal: 10:1 to 20:1. >20:1 suggests pre-renal (dehydration, CHF, GI bleed). <10:1 suggests intrinsic renal disease or low protein intake.