Urine Creatinine-to-Serum Creatinine Ratio

 

urine creatinine to serum creatinine ratio =

= (urine creatinine in mg/dL) / (serum creatinine in mg/dL)

 

Interpretation

 

A ratio > 40 is seen in:

(1) prerenal azotemia

(2) acute glomerulonephritis

(3) hepatorenal syndrome

 

A ratio < 20 is seen in:

(1) acute tubular necrosis (acute oliguric renal failure)

(2) acute obstructive renal failure

(3) acute nonoliguric renal failure