Urea to creatinine ratio calculator for SI units
Posted by dkwinter
Check out the Normal X-Rays iPhone App and website, from the creators of Compendium. Currently available at an introductory price:

Very useful for US-trained physicians who want to calculate the familiar BUN/Cr ratio but using SI inputs.

Urea/Creatinine Ratio Calculator

Urea level (mmol/L): OR
Urea level (mg/dL):

Creatinine level (umol/L): OR
Creatinine level (mg/dL):

Conventional urea/creatinine ratio (mg/dL)/(mg/dL): N.b. Consider prerenal causes of kidney injury when BUN/Cr >20

SI urea/creatinine ratio (mmol/L)/(umol/L):


More notes:

  • Low BUN/Creat ratio can be caused by:
    • inadequate protein intake
    • reduced urea synthesis as in advanced liver disease
    • increased creatinine production as in rhabdomyolysis



See also:

     Serum creatinine concentration conversion calculator for conventional and SI units