AST or aspartate aminotranferase is an enzyme that naturally occurs in the blood. The amount of AST in the blood is measured by a blood test.

AST Test Overview

This source begins with a simple overview that defines AST. For more information on the test and how it is performed, click the Next link at the bottom of the page.

Click here for information about the normal levels of AST and what abnormal results may indicate.

Related tests:

AST is tested as part of a routine liver panel, which also includes:

• ALP
• ALT (To learn more about how ALT and AST results should be interpreted together, click here.)
• Serum Albumin
• Serum Globulin
• Prothrombin Time
• Serum Ammonia
• Serum Bilirubin

Possible causes include:

• Liver disease
• Cirrhosis