ALT (Alanine Aminotransferase)
ALT is a liver enzyme. It rises when liver cells are damaged (hepatitis, fatty liver, medications).
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Normal ranges
Men: 10–40 U/L. Women: 7–35 U/L.
Units: U/L
Causes of deviations
Low levels:
Usually not clinically significant.
High levels:
Hepatitis, fatty liver disease, hepatotoxic drugs, alcohol.
When to see a doctor
If elevated more than 2x the upper limit.
Related biomarkers
Panels
Liver panel
Conditions
Liver disease
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