AST Test
An enzyme found in the liver, heart, and muscle. Often interpreted alongside ALT.
What is AST?
An enzyme found in the liver, heart, and muscle. Often interpreted alongside ALT.
AST Reference Range
These are the typical adult reference ranges used by major US labs. Your report will include the specific range used by the lab that processed your sample.
| Population | Range |
|---|---|
| Male, age 18+ | 8.00 – 48.0 U/L |
| Female, age 18+ | 8.00 – 43.0 U/L |
Reference ranges are educational. Always interpret your result with the specific range printed on your lab report and discuss anything outside the range with a clinician.
What your AST result may mean
Can reflect liver injury, intense exercise, muscle injury, or heart-related stress.
Educational only — not a diagnosis. Many factors can influence a single result. Discuss anything that concerns you with a healthcare provider.
Sources
Related Metabolic Health biomarkers
Markers commonly tested alongside AST.
Frequently asked
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