What is a breath test primarily measuring?

The breath test, specifically when using devices like the Intoxilyzer 8000, is primarily measuring breath concentration. This means that the test quantifies the amount of alcohol present in the breath, which is then used to extrapolate the blood alcohol concentration (BAC) of the individual. The technology works on the principle that the amount of alcohol vapor in the breath is directly related to the blood alcohol content, making breath concentration a key element in determining impairment due to alcohol consumption.

In contrast, other options such as oxygen levels, breath volume, and carbon dioxide levels are not relevant to the breath alcohol test. While oxygen levels and carbon dioxide levels are important in other medical assessments, they do not provide information about alcohol intoxication. Similarly, breath volume refers to the amount of air expelled during the breath test but does not indicate the concentration of alcohol in that air. Thus, measuring breath concentration is essential for the accurate assessment of alcohol impairment.