Aspartate Aminotransferase (AST) is an important enzyme found primarily in liver, heart, and muscle tissues. When any of these tissues are damaged, AST is released into the bloodstream. Measuring the level of AST in the bloodstream is a critical indicator for detecting liver damage and diagnosing liver diseases. AST is also known as SGOT (serum glutamic-oxaloacetic transaminase) and is used to evaluate liver function. When the liver is damaged, more AST is released into the blood, leading to elevated blood levels. High AST levels indicate a disorder or damage in the liver or other organs where the AST enzyme is found.

AST levels are generally considered high when they exceed reference values, typically ranging from 8 to 33 U/L; however, this range can vary by laboratory. The primary conditions leading to high AST include liver cancer, chronic hepatitis, cirrhosis, and bile duct obstructions. Symptoms associated with elevated AST may include nausea, vomiting, abdominal pain, jaundice, loss of appetite, and fatigue.

In healthy individuals, AST levels typically remain within normal limits, and low AST levels rarely constitute a dangerous condition on their own. However, low AST levels can be an indicator of certain medical conditions such as kidney diseases, diabetes, nutritional deficiencies, or vitamin B6 deficiency. Generally, as long as it is kept under control, low AST levels do not pose a serious health risk.