Serum Ethanol Concentration (Mass Concentration)

Why Is This Test Done?

Your healthcare provider may order this test if you’ve been exposed to alcohol in high amounts (e.g., drinking heavily or accidentally ingesting alcohol), if you’re suspected of alcohol poisoning, or if you’re being evaluated for alcohol-related health issues like liver damage or addiction. It can also be part of routine screening for people at risk of alcohol misuse.

What to Expect Before the Test

No special preparation is needed for this test. You’ll have a small needle inserted into your arm or vein to draw blood. If you’ve recently eaten, fasting isn’t required, but drinking alcohol before the test may affect results. Tell your doctor about any medications or supplements you’re taking.

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL). Higher levels may indicate recent alcohol consumption, while very high levels could suggest alcohol poisoning. Chronic alcohol use may show consistent elevated levels over time. Your doctor will interpret results in the context of your medical history and symptoms.

Common Causes of Abnormal Results

Elevated ethanol levels can occur from recent alcohol ingestion, alcohol poisoning, or certain medical conditions (e.g., diabetic ketoacidosis). False elevations may happen with certain medications or laboratory errors. Low levels might indicate recent abstinence or medical conditions affecting alcohol metabolism.