AST
AST is an enzyme in liver cells (and some in muscle and heart). When these cells are damaged it leaks into the blood. Together with ALT it is part of the basic liver panel — but it is less specific for the liver than ALT.
| Rating | Range | What it means |
|---|---|---|
| Good | below 35 U/L | Within range. |
| Worth improving | 35 – 50 U/L | |
| Talk to a doctor | 50 U/L and above |
Why it matters
EASL: interpret together with ALT; the ratio helps identify the cause.
If it’s low
Low AST has no clinical significance.
If it’s high
Elevated AST often accompanies liver stress (fatty liver, alcohol), but can also be muscle exertion or injury. The context (ALT, GGT, symptoms) tells where it comes from.
What to do
Read it together with ALT and GGT. If the cause is hepatic: less alcohol and sugar, fat loss, physical activity. Do not measure right after intense exercise.
Read together with
ALT · GGT · Bilirubin (total) · Alkaline phosphatase (ALP)
Part of the guide: Liver →
Articles about this marker
- Blood chemistry tests: normal values for ALT, AST, GGT, CRP, CK, creatinine and glucoseReading your report
- Fatty liver: what raised liver enzymes mean and what FIB-4 isLiver
- Liver tests (ALT, AST, GGT): what they mean and how to help your liverMarker explained
This content is for information only and is not a substitute for medical advice. Talk to your doctor about your results.
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