Alanine Aminotransferase (ALT)
Liver enzyme test
What This Test Measures
ALT is an enzyme found mainly in the liver. It helps process proteins and is released into the bloodstream when liver cells are damaged.
Normal Reference Ranges
| Gender | Age Range | Normal Range | Unit |
|---|---|---|---|
| Male | All ages | 7.0000 - 56.0000 | U/L |
| Female | All ages | 7.0000 - 45.0000 | U/L |
Understanding Your Results
High
What it means: Your ALT level is elevated, which may indicate liver inflammation or damage.
Common causes: Fatty liver disease, hepatitis, alcohol use, certain medications, obesity, or muscle injury.
Next steps: Your doctor may recommend additional tests (like imaging or hepatitis panel), review your medications, and discuss lifestyle changes.
Low
What it means: Low ALT levels are generally not a concern and are rarely clinically significant.
Common causes: Normal variation, vitamin B6 deficiency (rare).
Next steps: Usually no action needed. Your doctor may monitor if other symptoms are present.
Normal
What it means: Your ALT level is within the normal range, suggesting your liver is functioning properly.
Common causes: Healthy liver function with no significant inflammation or damage.
Next steps: Continue with regular health checkups and maintain a healthy lifestyle.
Medical Disclaimer
This information is for educational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Lab test results should always be interpreted by a qualified healthcare provider in the context of your complete medical history and current health status. Reference ranges may vary between laboratories. Always consult your doctor about your specific results.