Aspartate Aminotransferase (AST)
Liver and heart enzyme test
What This Test Measures
AST is an enzyme found in the liver, heart, muscles, and other tissues. Elevated levels may indicate liver damage or other tissue injury.
Normal Reference Ranges
| Gender | Age Range | Normal Range | Unit |
|---|---|---|---|
| All | All ages | 10.0000 - 40.0000 | U/L |
Understanding Your Results
High
What it means: Elevated AST may indicate liver damage, heart problems, or muscle injury.
Common causes: Liver disease, heart attack, muscle damage, alcohol use, certain medications, or strenuous exercise.
Next steps: Your doctor may order additional tests (liver panel, cardiac enzymes, imaging) and review your recent activities and medications.
Low
What it means: Low AST is rarely a clinical concern and is often a normal variation.
Common causes: Normal variation, vitamin B6 deficiency (uncommon).
Next steps: Usually no action required unless accompanied by other abnormal results.
Normal
What it means: Your AST level is within the normal range, indicating healthy liver and tissue function.
Common causes: Normal liver, heart, and muscle function.
Next steps: Continue regular health monitoring and maintain a balanced 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.