AST (Aspartate Aminotransferase) test is a blood test that measures the level of AST enzyme in the blood. AST is an enzyme found in various parts of the body, including the liver, heart, muscles, kidneys, and brain. It plays a role in amino acid metabolism. The test is commonly used to assess liver health, but because AST is present in multiple organs, it's not as specific to liver damage as ALT (Alanine Aminotransferase). Elevated AST levels can indicate damage or disease affecting the liver or other tissues where AST is found. The AST test is often performed alongside other tests, such as the ALT test, to diagnose or monitor liver disease and to determine if elevated enzymes are due to liver damage or muscular injuries.