AST (Aspartate Aminotransferase)
Also known as: AST, SGOT, Aspartate transaminase
AST (aspartate aminotransferase) is an enzyme found in the liver and in other tissues such as muscle. Because it is not unique to the liver, it is interpreted alongside ALT and other tests.
Why it's measured
AST appears on liver panels and is most useful when read together with ALT and the rest of your liver tests. Its presence in muscle means activity and other factors can influence it.
Typical range
Reference ranges differ by lab. Since AST comes from more than just the liver, your doctor considers the full panel and your situation when interpreting it.
What high values can mean
A higher AST is one of several markers doctors weigh when looking at the liver or muscle, not a standalone diagnosis.
What low values can mean
Lower AST is generally not concerning on its own and is read in context with your other results.
Questions to ask your doctor
- How do my AST and ALT look together?
- Could recent exercise or anything else have affected my AST?
- Is follow-up testing helpful here?
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Try the explainerEducational information only — not medical advice, diagnosis, or treatment. Reference ranges vary by lab; always use your own lab's range and discuss results with a qualified clinician.