LION SD-400 - Page 36

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SD-400 User Handbook [v7]
A3.2 Blood Alcohol (BAC) Units
BAC Units: Written As:
milligrams per hundred millilitres
mg/100ml or mg/% or mg/dl
percent blood alcohol
%BAC or %BAL
promille [weight/volume]
g/l or ‰ w/v
promille [weight/weight]*
g/Kg or ‰ w/w
A3.3 Blood:Breath Ratios
The true in-vivo ratio is close to 2,300:1, as it relates to pulmonary
arterial blood. The use of values lower than this will cause the
breath analysis to under-read the blood alcohol level. This is
sometimes adopted to as to give an allowance to the subject.
A3.4 Units and Ratio Conversion
The following measurements all represent the same absolute
concentration of alcohol in an individual's body at some point in time:
Breath alcohol levels as measured absolutely:
0.35mg/l  35g/100ml  350g/l
These convert to the following blood alcohol concentrations (all
figures are rounded down):
Ratio: 2 000:1
70mg/100ml  .070%BAC  0.70‰ (w/v)  0.66‰ (w/w)
Ratio: 2 100:1
73mg/100ml  .073%BAC  0.73‰ (w/v)  0.68‰ (w/w)
Ratio: 2 300:1
80mg/100ml  .080%BAC  0.80‰ (w/v)  0.75‰ (w/w)
Note: the specific gravity of whole blood is about 1.06.
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