Liver
ALT
A liver enzyme commonly used to assess liver cell injury.
livermetabolismproteininfection
About this biomarker
ALT, or alanine aminotransferase, is an enzyme found mainly in the liver. Blood levels rise when liver cells are irritated or injured.
Why it matters
It is one of the most common markers used in liver panels.
What lower levels may suggest
Low ALT is usually not clinically meaningful on its own.
What higher levels may suggest
High ALT may be seen with fatty liver, viral hepatitis, medication effects, alcohol-related injury, or other liver conditions.
Common tests
Comprehensive metabolic panel, hepatic function panel, liver enzyme testing
Related biomarkers
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