In the United States urea is reported as mg/dL of urea nitrogen, while almost everyone else reports it as mmol/L of urea (carbamide).
urea = H2N-CO-NH2
molecular weight of urea = 60.06 grams
1 mole of nitrogen = 14.007 grams
1 mole of urea contains 2 moles of nitrogen (28.014 grams); nitrogen represents 46.6% of urea by weight.
1 gram of urea nitrogen indicates to 2.146 grams, or 0.0357 moles, of urea.
1 mg/dL of urea nitrogen = 10 mg/L urea nitrogen = 0.714 mmol/L urea nitrogen = 0.357 mmol/L urea
1 mmol/L urea = 2.801 mg/dL urea nitrogen
Urea can also be expressed in mg/dL.
1 mg/dL urea = 0.167 mmol/L urea
1 mmol/L urea = 6 mg/dL urea
1 mg/dL BUN = 2.146 mg/dL urea
