What is an AST Test?
An AST test, or aspartate aminotransferase test, measures the amount of AST enzyme in your blood. AST is primarily found in the liver, but also exists in muscles and other organs. When these cells are damaged, they release AST into the bloodstream, resulting in elevated levels detectable via a blood test. This test is crucial in assessing liver health and detecting potential damage.
The AST test is a simple blood test used to evaluate liver function. It's frequently ordered alongside other liver function tests, particularly ALT (alanine aminotransferase), to provide a more comprehensive picture of liver health.
What does the AST test measure?
The test quantifies the level of aspartate aminotransferase (AST) in your blood. High levels usually indicate liver damage, but this isn't always the case. Elevated AST can also stem from muscle damage or other conditions.
Why is an AST test ordered?
Your doctor may order an AST test if you exhibit symptoms suggesting liver problems, such as:
- Jaundice (yellowing of the skin and eyes)
- Abdominal pain
- Fatigue
- Dark urine
- Light-colored stools
The test is also used to monitor liver disease progression and response to treatment.
Interpreting AST Test Results
- High AST levels: Often suggest liver damage, but the cause could be various, including hepatitis, cirrhosis, liver cancer, or muscle damage. The result needs to be interpreted in conjunction with other tests.
- Normal AST levels: Generally indicate healthy liver function, though it doesn't rule out other medical issues.
- Low AST levels: Are less common and may not have significant clinical meaning.
Other Names for the AST Test
The AST test might also be referred to as the SGOT test (serum glutamic-oxaloacetic transaminase).
Additional Resources
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