Test Code 1002
Test Details
Aspartate Aminotransferase (AST)
AST is an enzyme that is widely distributed in tissue, mainly hepatic, cardiac, muscle, and kidney.
Methodology
Enzymatic
Patient Preparation
None
Preferred Specimen
1.0 mL serum (0.5 mL minimum) collected in serum separator tube (SST/Tiger Top)
Alternate Specimen
1.0 mL EDTA plasma (0.5 mL minimum) collected in plasma separator tube (Pearl Top)
Transport Temperature
Refrigerated (ship on frozen cold packs)
Stability
Refrigerated: 7 days
Lab Values
Aspartate Aminotransferase (AST)
- Optimal: <40 U/L
- Borderline: 40 – 120 U/L
- Increased Risk: >120 U/L
- Alert: >240 U/L
Clinical Significance
Aspartate Aminotransferase (AST)
Elevated serum levels indicate damage to the liver, cardiac, muscle, and kidney tissues that may be caused by existing conditions or medications.
Treatment Options
Aspartate Aminotransferase (AST)
- Treatment is based on cause of elevation.
- Consider additional diagnostic tests as indicated.
