Page last updated April 2020

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Blood Alcohol

Blood alcohol levels are determined for toxicology and legal purposes.

In many jurisdictions, a blood alcohol level of 100 mg/dl defines the threshold for "driving while under the influence of alcohol". In other jurisdictions, the threshold is 80 mg/dl.

Diabetic ketoacidosis may falsely elevate blood alcohol levels.

Normal Values*

Normal None
  • Flushing

  • Slowed reflexes

  • Diminished visual acuity

50–100 mg/dl
CNS depression >100 mg/dl
Possible death >400 mg/dl

*These are general values taken from a variety of sources. The actual normal values may vary from lab to lab and from one type of testing protocol to another.