Causes of Elevated Aspartate Aminotransferase (AST)

Aspartate aminotransferase (AST), clinically also known as glutamic-oxaloacetic transaminase (GOT), is abbreviated as AST in liver function tests. Its concentration is highest in myocardial and hepatocytes. AST is present both in the mitochondria and cytoplasm of hepatocytes and primarily reflects hepatic functional status. So, what causes elevated aspartate aminotransferase levels? Below is an overview.

Causes of Elevated Aspartate Aminotransferase

1. Liver Diseases

Certain liver diseases can lead to elevated aspartate aminotransferase levels, including alcoholic liver disease, fatty liver disease, cirrhosis, hepatocellular carcinoma, hepatitis B, and hepatitis A. Additionally, hepatic tumors—whether primary or metastatic—can also cause increased AST levels.

2. Vascular Disorders

Vascular disorders may result in elevated aspartate aminotransferase. For example, Budd–Chiari syndrome—a condition caused by obstruction of the hepatic veins or the inferior vena cava above the hepatic vein orifices—can induce hepatic injury and subsequent elevation of transaminases, including AST.

3. Medication Use

Certain medications can elevate aspartate aminotransferase levels because drugs are metabolized and absorbed primarily by the liver; some drugs may exert hepatotoxic effects, leading to liver damage and consequent AST elevation. Moreover, chronic heavy alcohol consumption may also result in elevated AST levels during liver function testing.

The above outlines the main causes of elevated aspartate aminotransferase, including liver diseases, vascular disorders, medication use, and unhealthy dietary habits. We hope this information proves helpful to you.