Units BUN (urea-N) is mg/dL in the United States, Mexico, Italy, Austria, and Germany. Elsewhere, the concentration of urea is reported  as mmol/L,  generally depending on the lab. BUN (urea-N) SI unit is mmol / L BUN%DIFDELCMD < [%%% mmol/L = BUN%DIFDELCMD < [%%% mg/dL * 0.3571%DIFDELCMD < %DIFDELCMD < %%% To convert from mg/dL of blood urea nitrogen to mmol/L of urea, multiply by 0.357 (each molecule of urea having two nitrogens , each of molar mass 14g/mol ) (BUN is the mass of nitrogen within urea/volume, not the mass of urea) Urea mmol/L%DIFDELCMD < ] %%% = BUN mg/dL of nitrogen x 10%DIFDELCMD < [%%% dL /L / 14x2 mg N/mmol urea%DIFDELCMD < ] %%% (the mass of nitrogen within urea is used) convert  BUN to urea in mg/dL by using following formula: Urea mg/dL%DIFDELCMD < ]%%% = BUN mg/dL%DIFDELCMD < ] %%% * 2.14 (conversion factor derived by: MW of urea = 60, MW of urea nitrogen = 14x2 => 60/28 = 2.14) factor = 1 for conversions in mmol (1 mole N2 = 2 moles N per mole of urea): BUN%DIFDELCMD < [%%% mmol/L = urea%DIFDELCMD < [%%% mmol/L
Units BUN (urea-N) is mg/dL in the United States, Mexico, Italy, Austria, and Germany. Elsewhere, the concentration of urea is reported in SI unit as mmol/L, which is generally depending on the lab. represents the mass of nitrogen within urea / %DIFDELCMD < [%%% %DIFDELCMD < [%%% %DIFDELCMD < %DIFDELCMD < %%% volume, not the mass of whole urea. Each molecule of urea has two nitrogen atoms , each of molar mass 14g/mol %DIFDELCMD < ] %%% . To convert from mg/dL of %DIFDELCMD < [%%% blood urea nitrogen to mmol /L %DIFDELCMD < ] %%% of urea: Note that molar concentrations of urea and urea nitrogen are equal, because both nitrogen gas and urea has two nitrogen atoms. Convert BUN to urea in mg/dL by using following formula: %DIFDELCMD < ]%%% %DIFDELCMD < ] %%% Where 60 represents MW of urea and 14*2 MW of urea nitrogen %DIFDELCMD < [%%% %DIFDELCMD < [%%% .
A
in SI unit
A
which is
R
BUN (urea-N) SI unit is mmol
represents the mass of nitrogen within urea
D
L
D
BUN
D
mmol/L
D
= BUN
D
mg/dL
D
* 0.3571
R
To convert from mg/dL of blood urea nitrogen to mmol/L of urea, multiply by 0.357 (each
volume, not the mass of whole urea. Each
R
having two nitrogens
has two nitrogen atoms
D
) (BUN is the mass of nitrogen within urea/volume, not the mass of urea) Urea
D
mmol/L
R
= BUN
. To convert from
D
nitrogen
D
x 10
R
dL
blood urea nitrogen to mmol
D
/ 14x2
D
mg N/mmol urea
R
(the mass of nitrogen within urea is used)
of urea:
R
convert
Note that molar concentrations of urea and urea nitrogen are equal, because both nitrogen gas and urea has two nitrogen atoms.
A
Convert
D
Urea
D
mg/dL
D
= BUN
D
mg/dL
D
* 2.14
R
(conversion factor derived by:
Where 60 represents
R
= 60,
and 14*2
D
= 14x2 => 60/28 = 2.14)
D
factor = 1 for conversions in mmol (1 mole N2 = 2 moles N per mole of urea): BUN
D
mmol/L
D
= urea
R
mmol/L
.