Source:http://lifeinthefastlane.com/education/investigations-tests/urea-creatinine-ratio/
The relationship of urea and creatine is dependent on serum laboratory units used to determine the cause of acute kidney injury.
- In the US the urea is expressed as BUN (Blood Urea Nitrogen) in mg/dL. Elsewhere Urea (U) is expressed as mmol/L
- Similarly Creatinine (Cr) is expressed as mg/dL in the US and µmol/L elsewhere
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Therefore two ratio’s exist to compare serum Urea and Creatinine levels
- BUN : Cr ratio with US units of mg/dL : mg/dL
- Urea: Cr ratio ith SI Units of mmol/L: µmol/L (providing Urea is >10mmol/L)
- Cr: Urea ratio with SI Units of µmol/L: mmol/L (providing Urea is >10mmol/L)
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