(a) Blood alcohol concentration.

1. (1)

   1. (A) The results of an analysis of blood, urine, or other bodily fluid shall be expressed in terms of percent weight/volume (% w/v) defined as grams of alcohol per one hundred milliliters (100 mL) of blood and reported to the second decimal place only.
   2. (B) For example, two hundred thirty-nine thousandths of one percent weight per volume (0.239% w/v) shall be reported as twenty-three hundredths of one percent weight per volume (0.23% w/v).
2. (2) Test results are not to be rounded off.
3. (3) The third decimal place is to be dropped.

4. (4)

   1. (A) Percent weight per volume is obtained by dividing the weight of alcohol in a sample expressed in grams by the volume of the sample expressed in milliliters and multiplying by one hundred (100).
   2. (B) This result represents the concentration of alcohol in the blood (% BA, % BAC, % w/v).

(b) Urine analysis.

1. (1) For this part, the alcohol in a urine sample shall be treated as equivalent to one and three tenths (1.3) times the concentration in whole blood.
2. (2) Given a urine test result of fifteen hundredths of one percent weight per volume (0.15% w/v): 1.3x = 0.15% where x = % blood alcohol x = 0.15% 1.3 x = 0.115% (report as 0.11% blood alcohol)

(c) Serum or plasma analysis.

1. (1) For this part, the alcohol in a serum or plasma sample shall be treated as one and fifteen hundredths (1.15) times the concentration in whole blood.
2. (2) Given a serum or plasma test result of twelve hundredths of one percent weight per volume (0.12% w/v): 1.15x = 0.12% where x = % blood alcohol x = 0.12% 1.15 x = 0.104% (report as 0.10% blood alcohol)

(d) Breath alcohol concentration.

1. (1) Breath test results are to be reported as grams of alcohol per two hundred ten liters (210 L) of breath.
2. (2) Breath-testing instruments approved and certified for use by the Office of Alcohol Testing report results in these units.