Ethanol (Serum or Plasma)

Why It’s Done

Doctors may order this test if you’ve been exposed to alcohol in high amounts, if you’ve experienced symptoms like confusion, vomiting, or slow breathing, or if you’re suspected of alcohol poisoning. It can also be used in legal cases, workplace safety checks, or during medical procedures requiring precise alcohol monitoring.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm to draw blood. If you’re tested for alcohol in a clinical setting (e.g., after a suspected overdose), you may be asked to provide a urine sample instead. Avoid eating or drinking for at least 2 hours before testing if instructed.

What the Results Mean

The test result shows the concentration of ethanol in your blood, measured in milligrams per deciliter (mg/dL). Higher levels may indicate recent heavy drinking or alcohol intoxication. Very low levels could suggest recent abstinence or medical conditions affecting alcohol metabolism.

Possible Causes of Abnormal Results

Elevated levels may be due to recent alcohol consumption, alcohol poisoning, or certain medications. Low levels might occur if you’ve recently stopped drinking, have liver disease, or are metabolizing alcohol faster than normal.