Liver Function
AST
Normal Range:10-40 U/L
Optimal Range:15-30 U/L
What is AST?
AST (Aspartate Aminotransferase) is an enzyme found in your liver, heart, and muscles. Elevated levels can indicate damage to any of these tissues.
Why AST Matters
AST, especially when compared to ALT (AST/ALT ratio), helps identify the cause of liver damage. It's also elevated after heart attacks or muscle injury.
Symptoms of Low AST
- Usually not concerning
- Very low levels are normal
Symptoms of High AST
- Often no symptoms
- Fatigue
- Abdominal discomfort
- Loss of appetite
- Jaundice
Reference Ranges
| Range Type | Minimum | Maximum | Unit |
|---|---|---|---|
| Normal Range | 10 | 40 | U/L |
| Optimal Range | 15 | 30 | U/L |