Alanine Aminotransferase (ALT)
Liver enzyme most specific to liver damage. The primary marker for hepatitis, fatty liver, and drug-induced liver injury.
Typical normal range
Men: 7–56 · Women: 7–45 U/L
If high ↑
Liver inflammation: hepatitis, NAFLD, alcohol, medications, celiac disease
If low ↓
Generally favorable; very low in advanced liver disease
What is a normal Alanine Aminotransferase level?
A typical reference range is Men: 7–56 · Women: 7–45 U/L. Ranges vary between laboratories and can depend on age and sex, so compare your result with the range printed on your own report.
What does a high Alanine Aminotransferase level mean?
Liver inflammation: hepatitis, NAFLD, alcohol, medications, celiac disease. A single result rarely gives a diagnosis on its own; your doctor will interpret it alongside your symptoms and other tests.
What does a low Alanine Aminotransferase level mean?
Generally favorable; very low in advanced liver disease. Your doctor will interpret it alongside your symptoms and other tests.
About the Liver Panel
Liver tests measure enzymes and proteins made by the liver. Raised levels can point to inflammation or damage, and they are often checked when starting certain medicines.
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Medical disclaimer: Reference ranges vary by laboratory, age, sex, and clinical context. This page is for educational purposes only and is not a diagnosis. Always discuss your results with a qualified healthcare professional.