Understanding SGOT / Aspartate Aminotransferase (AST): Normal vs Optimal Ranges

?What is SGOT / Aspartate Aminotransferase (AST)?

Aspartate aminotransferase (AST) is an enzyme found primarily in the liver, heart, and skeletal muscles that catalyzes the transfer of amino groups during protein metabolism. When cells are damaged or undergo stress, AST is released into the bloodstream, making it a useful marker of hepatic and cardiac injury. AST levels are measured in serum (blood) and are commonly included in standard liver function panels.

!Why It Matters

Elevated AST may suggest liver damage from viral hepatitis, alcohol use, fatty liver disease, or cirrhosis, or could indicate heart or muscle injury. Persistently abnormal AST levels can be associated with systemic inflammation or metabolic dysfunction and warrant further investigation. The AST-to-ALT ratio can help differentiate the type and severity of liver injury.

Reference Ranges

Lab normal ranges may vary between laboratories. Optimal and longevity targets are based on research literature and should be interpreted with your physician.

Symptoms of Imbalance

• Jaundice or yellowing of skin and eyes
• Abdominal pain or swelling
• Unexplained fatigue or weakness
• Nausea or loss of appetite
• Dark urine or pale stools

How to Improve Your Levels

• 1Limit or eliminate alcohol consumption to reduce hepatic stress
• 2Maintain a balanced, whole-food diet low in processed foods and added sugars
• 3Achieve and maintain a healthy body weight to reduce fatty liver risk
• 4Stay hydrated and support liver function with adequate water intake
• 5Avoid hepatotoxic medications and supplements unless medically necessary
• 6Engage in regular moderate exercise to improve metabolic health and circulation

When to Test

AST should be tested as part of routine liver function screening, before and during treatment for liver disease, when symptoms of liver or heart dysfunction are present, or when taking medications known to affect liver function. Annual screening is reasonable for those with risk factors such as chronic alcohol use, viral hepatitis exposure, or obesity.

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