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ALT Liver Test: What Your Results Mean

ALT (Alanine Aminotransferase) is an enzyme found primarily in liver cells. When liver cells are damaged, they release ALT into the bloodstream. It is one of the most specific markers of liver cell damage and is routinely used to screen for liver disease.

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Normal Range

7 – 56 U/L

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Unit

U/L

What Your Results Mean

Normal

Normal ALT indicates healthy liver cells with no significant damage or inflammation.

High

Elevated ALT signals liver cell damage. Mild elevations (1–3x normal) can result from fatty liver, alcohol use, or medications. Severe elevations (10x+ normal) suggest significant liver injury from hepatitis, toxins, or ischemia.

Low

Low ALT is generally not clinically significant and is not a marker of disease.

Frequently Asked Questions

What is a normal ALT level? expand_more

Normal ALT is 7–56 U/L for most adults, though ranges vary slightly by laboratory and sex.

What causes high ALT? expand_more

Non-alcoholic fatty liver disease (NAFLD), alcohol use, viral hepatitis B and C, certain medications (statins, acetaminophen), obesity, and celiac disease are common causes.

Should I be worried about mildly elevated ALT? expand_more

Mildly elevated ALT (1–2x normal) is common and often caused by fatty liver or recent intense exercise. Persistent elevation warrants further investigation.

How can I lower my ALT levels? expand_more

Reduce alcohol consumption, lose excess weight, avoid unnecessary medications and supplements, treat underlying conditions, and exercise regularly.

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