High Aspartate Aminotransferase (AST): what it means
A Aspartate Aminotransferase (AST) result above the normal range is considered high. Here is what a raised Aspartate Aminotransferase (AST) can point to, and when it is worth discussing with a doctor.
Reference range: Approximately 8–40 U/L; lab-specific
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What a high Aspartate Aminotransferase (AST) can mean
- Liver injury — viral hepatitis, NAFLD, drug-induced liver injury, alcohol.
- AST/ALT ratio > 2 — classic for alcohol-related liver disease.
- Cardiac injury — historically used for myocardial infarction (troponin replaced this role).
- Skeletal muscle injury — rhabdomyolysis, recent very strenuous exercise.
- Haemolysis — red blood cells contain AST.
When to discuss with a doctor
AST elevation alongside ALT elevation warrants follow-up with the rest of the liver panel and a primary-care visit. Very-high AST without a corresponding ALT rise should prompt a check of CK (muscle injury) and the haemolysis panel. AST >1000 U/L is acute liver injury and needs same-day evaluation.
How to bring a high Aspartate Aminotransferase (AST) down
- AST rises with the same liver causes as ALT - fatty liver, alcohol and medications; the same levers (weight loss, less alcohol, medication review) apply.
- Remember AST also comes from muscle - intense exercise or a muscle injury before the test can raise it; retest after a few rest days.
- Reduce alcohol - AST often rises more than ALT with alcohol.
- Discuss a persistent rise with your doctor, who will read AST alongside ALT and GGT.
General information, not a treatment plan - decisions about medication or target values belong with your doctor.
Conditions this can relate to
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