Quick Medical Unit Conversion for Blood Urea Nitrogen & Serum Urea
Formula:
Understanding BUN to Urea Conversion Formulas
Blood Urea Nitrogen (BUN) scales quantify the total concentration of nitrogen present within blood serum. Because urea is synthesized by the liver to eliminate toxic nitrogen compounds from protein digestion, clinical practitioners routinely jump between structural metrics depending on geographical lab protocols.
The Biological Conversion Ratios
- BUN (mg/dL) to Urea (mg/dL): Multiply BUN value by 2.14
- Urea (mg/dL) to BUN (mg/dL): Divide Urea value by 2.14
- BUN (mg/dL) to Urea (mmol/L): Multiply BUN value by 0.357
Why is there a difference between BUN and Urea measurements?
The core distinction relies entirely on chemical weights. The standard molecule of Urea (CH4N2O) features an approximate molecular weight of 60 g/mol. Conversely, the combined weight of its constituent reactive Nitrogen atoms equals 28 g/mol (14 × 2). The resulting mathematical ratio (60 / 28) yields the standard 2.14 conversion factor used universally by global diagnostic systems.